feat: add metricsServer for health checks, metrics and pprof (#5578)

Add a separate HTTP listener for observability, configured through
metricsServer in both frps and frpc. It serves /healthz and, when
pprofEnable is set, the pprof handlers except /debug/pprof/cmdline. It
never serves the dashboard, static assets or the admin API, and it does
not touch the global assets filesystem.

frps also serves /metrics on this listener with both runtime and business
metrics, enabled by metricsServer.port alone. The in-memory collector
still starts only with the dashboard, and the Prometheus collector starts
either with metricsServer or with enablePrometheus plus webServer, so a
configuration that collected nothing before still collects nothing.

The /healthz, /metrics and pprof endpoints on webServer, and
enablePrometheus, keep working but are deprecated and log a hint at
startup. frpc does not serve /metrics yet.

README.md

@@ -616,13 +616,31 @@ Proxies and visitors managed through the Store are saved to disk and automatical
 
 When web server is enabled, frps will save monitor data in cache for 7 days. It will be cleared after process restart.
 
-Prometheus is also supported.
+Both frps and frpc support a separate `metricsServer` listener for health checks and optional profiling, without enabling the dashboard or admin API. It is disabled by default (`metricsServer.port = 0`) and binds to `127.0.0.1` unless configured otherwise.
+
+`/healthz` returns an empty HTTP 200 response without authentication. It checks that the HTTP server is responding; it does not indicate whether frpc is connected to frps or whether proxies are ready.
 
 #### Prometheus
 
-Enable dashboard first, then configure `enablePrometheus = true` in `frps.toml`.
+Configure a dedicated listener in `frps.toml`:
 
-`http://{dashboard_addr}/metrics` will provide prometheus monitor data.
+```toml
+metricsServer.addr = "127.0.0.1"
+metricsServer.port = 7501
+metricsServer.user = "monitor"
+metricsServer.password = "change-me"
+# Optional TLS, independent of webServer:
+# metricsServer.tls.certFile = "metrics.crt"
+# metricsServer.tls.keyFile = "metrics.key"
+# Profiling is disabled unless explicitly enabled:
+# metricsServer.pprofEnable = true
+```
+
+Scrape `http://127.0.0.1:7501/metrics` using these Basic Auth credentials. This automatically enables frps business metrics, even when `webServer` is disabled and `enablePrometheus` is unset. Credentials and TLS are independent of `webServer`; when credentials are configured, both `/metrics` and profiling endpoints require authentication. `/healthz` remains anonymous.
+
+Set `metricsServer.pprofEnable = true` to expose `/debug/pprof/` and profiling endpoints on this listener. `/debug/pprof/cmdline` is excluded. frpc supports the same health and profiling settings, but does not provide `/metrics` yet.
+
+The `/healthz`, `/metrics`, and pprof endpoints on `webServer` are deprecated but remain available. `enablePrometheus = true` still enables the legacy frps `/metrics` endpoint on the dashboard listener. Migrate health probes, Prometheus scrapes, and profiling to `metricsServer`; the dashboard and admin APIs continue to use `webServer`.
 
 ### Authenticating the Client
 
@@ -714,7 +732,7 @@ transport.tls.trustedCaFile = "ca.crt"
 
 By default, when neither `transport.tls.trustedCaFile` nor `transport.tls.useSystemCa` is set, `frpc` does not verify the server certificate. Set `transport.tls.useSystemCa = true` to verify it using the host's system CAs. If `trustedCaFile` is also set, its CA certificates are added to the system CA pool; setting only `trustedCaFile` trusts only the CAs in that file. CA loading or certificate verification failures cause the connection to fail without falling back to another trust source or skipping verification.
 
-`useSystemCa` is supported only in `frpc`'s `transport.tls`, and requires `transport.tls.enable = true` unless `transport.protocol = "wss"`. With `wss`, the outer TLS connection is always enabled and verification applies to the TLS endpoint, which may be a reverse proxy. Setting `useSystemCa = true` in `frps`'s `transport.tls` or either process's `webServer.tls` is a configuration error.
+`useSystemCa` is supported only in `frpc`'s `transport.tls`, and requires `transport.tls.enable = true` unless `transport.protocol = "wss"`. With `wss`, the outer TLS connection is always enabled and verification applies to the TLS endpoint, which may be a reverse proxy. Setting `useSystemCa = true` in `frps`'s `transport.tls` or either process's `webServer.tls` or `metricsServer.tls` is a configuration error.
 
 **`frps` TLS settings:**
 

Release.md

@@ -2,6 +2,9 @@
 
 * frpc can verify server certificates using system CAs, optionally combined with CAs from `trustedCaFile`.
 * `frpc reload` now refreshes certificate files for unchanged `https2http` and `https2https` proxies without interrupting existing connections. Failed refreshes keep the previous certificate and report the error in proxy status and logs while reload still succeeds.
+* Added `metricsServer` to both frps and frpc, a separate listener for health checks and optional profiling that does not expose the dashboard or the admin API. It is disabled unless `metricsServer.port` is set, defaults to `127.0.0.1`, and has its own credentials and TLS. In frps, setting the port also serves `/metrics` with both runtime and business metrics, so `enablePrometheus` is not needed there.
+
+  The `/healthz`, `/metrics` and pprof endpoints on `webServer`, and `enablePrometheus`, still work but are deprecated: configure `metricsServer` instead. They will be removed in a later release.
 
 ## Fixes
 

client/metrics_server_test.go

@@ -0,0 +1,91 @@
+// Copyright 2026 The frp Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package client
+
+import (
+	"context"
+	"net"
+	"net/http"
+	"path/filepath"
+	"strconv"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/fatedier/frp/pkg/config/source"
+	v1 "github.com/fatedier/frp/pkg/config/v1"
+)
+
+func TestNewServiceReleasesWebServerOnMetricsServerFailure(t *testing.T) {
+	for _, mode := range []string{"port conflict", "invalid TLS certificate"} {
+		t.Run(mode, func(t *testing.T) {
+			ln, err := net.Listen("tcp", "127.0.0.1:0")
+			require.NoError(t, err)
+			defer ln.Close()
+			cfg := &v1.ClientCommonConfig{
+				WebServer:     v1.WebServerConfig{Port: getFreeTCPPort(t)},
+				MetricsServer: v1.MetricsServerConfig{Port: ln.Addr().(*net.TCPAddr).Port},
+			}
+			if mode == "invalid TLS certificate" {
+				cfg.MetricsServer.TLS = &v1.TLSConfig{
+					CertFile: filepath.Join(t.TempDir(), "missing.crt"), KeyFile: "missing.key",
+				}
+				require.NoError(t, ln.Close())
+			}
+			svr, err := NewService(ServiceOptions{
+				Common: cfg, ConfigSourceAggregator: source.NewAggregator(source.NewConfigSource()),
+			})
+			if svr != nil {
+				svr.Close()
+			}
+			require.Error(t, err)
+			require.Nil(t, svr)
+			assertLifecycleAdminPort(t, net.JoinHostPort(cfg.WebServer.Addr, strconv.Itoa(cfg.WebServer.Port)), true)
+			if mode == "invalid TLS certificate" {
+				assertLifecycleAdminPort(t, ln.Addr().String(), true)
+			}
+		})
+	}
+}
+
+func TestServiceMetricsServerLifecycle(t *testing.T) {
+	svr, err := NewService(ServiceOptions{
+		Common: &v1.ClientCommonConfig{
+			LoginFailExit: new(false), MetricsServer: v1.MetricsServerConfig{Port: getFreeTCPPort(t)},
+		},
+		ConfigSourceAggregator: source.NewAggregator(source.NewConfigSource()),
+		ConnectorCreator: func(context.Context, *v1.ClientCommonConfig) Connector {
+			return &failingConnector{err: net.ErrClosed}
+		},
+	})
+	require.NoError(t, err)
+	require.Nil(t, svr.webServer)
+	address := svr.metricsServer.Address()
+	done := make(chan struct{})
+	go func() { _ = svr.Run(context.Background()); close(done) }()
+	defer func() {
+		svr.Close()
+		waitLifecycleSignal(t, done)
+		assertLifecycleAdminPort(t, address, true)
+	}()
+	client := &http.Client{Timeout: 3 * time.Second}
+	for path, status := range map[string]int{"/healthz": http.StatusOK, "/metrics": http.StatusNotFound} {
+		resp, err := client.Get("http://" + address + path)
+		require.NoError(t, err)
+		require.Equal(t, status, resp.StatusCode)
+		require.NoError(t, resp.Body.Close())
+	}
+}

client/service.go

@@ -123,7 +123,8 @@ type Service struct {
 	auth *auth.ClientAuth
 
 	// web server for admin UI and apis
-	webServer *httppkg.Server
+	webServer     *httppkg.Server
+	metricsServer *httppkg.Server
 
 	vnetController *vnet.Controller
 
@@ -188,8 +189,8 @@ func NewService(options ServiceOptions) (*Service, error) {
 	proxyCfgs = config.CompleteProxyConfigurers(proxyCfgs)
 	visitorCfgs = config.CompleteVisitorConfigurers(visitorCfgs)
 
-	// Create the web server after all fallible steps so its listener is not
+	// Create HTTP servers after all other fallible steps, rolling back the web
-	// leaked when an earlier error causes NewService to return.
+	// listener if the metrics server cannot be created.
 	var webServer *httppkg.Server
 	if options.Common.WebServer.Port > 0 {
 		ws, err := httppkg.NewServer(options.Common.WebServer)
@@ -198,11 +199,19 @@ func NewService(options ServiceOptions) (*Service, error) {
 		}
 		webServer = ws
 	}
+	metricsServer, err := httppkg.NewMetricsServer(options.Common.MetricsServer, nil)
+	if err != nil {
+		if webServer != nil {
+			_ = webServer.Close()
+		}
+		return nil, err
+	}
 
 	s := &Service{
 		ctx:              context.Background(),
 		auth:             authRuntime,
 		webServer:        webServer,
+		metricsServer:    metricsServer,
 		common:           options.Common,
 		reloadCommon:     options.Common,
 		configFilePath:   options.ConfigFilePath,
@@ -263,6 +272,12 @@ func (svr *Service) Run(ctx context.Context) error {
 	}
 
 	if svr.webServer != nil {
+		if svr.common.WebServer.PprofEnable {
+			log.Warnf("webServer pprof endpoints are deprecated; use metricsServer.pprofEnable instead")
+		}
+		if svr.common.MetricsServer.Port == 0 {
+			log.Infof("webServer /healthz is deprecated; health probes can migrate to metricsServer.port")
+		}
 		webServer := svr.webServer
 		go func() {
 			log.Infof("admin server listen on %s", webServer.Address())
@@ -272,6 +287,16 @@ func (svr *Service) Run(ctx context.Context) error {
 		}()
 	}
 
+	if svr.metricsServer != nil {
+		metricsServer := svr.metricsServer
+		go func() {
+			log.Infof("metrics server listen on %s", metricsServer.Address())
+			if err := metricsServer.Run(); err != nil && !errors.Is(err, http.ErrServerClosed) {
+				log.Warnf("metrics server exit with error: %v", err)
+			}
+		}()
+	}
+
 	// first login to frps
 	svr.loopLoginUntilSuccess(10*time.Second, lo.FromPtr(svr.common.LoginFailExit))
 	if svr.ctl == nil {
@@ -497,6 +522,10 @@ func (svr *Service) stop() {
 		svr.webServer.Close()
 		svr.webServer = nil
 	}
+	if svr.metricsServer != nil {
+		svr.metricsServer.Close()
+		svr.metricsServer = nil
+	}
 	if svr.vnetController != nil {
 		_ = svr.vnetController.Stop()
 		svr.vnetController = nil

conf/frpc_full_example.toml

@@ -79,9 +79,22 @@ webServer.password = "admin"
 # Admin assets directory. By default, these assets are bundled with frpc.
 # webServer.assetsDir = "./static"
 
+# Deprecated: use metricsServer.pprofEnable for authenticated profiling.
 # Enable golang pprof handlers in admin listener.
 webServer.pprofEnable = false
 
+# Separate health and optional profiling listener. frpc does not serve /metrics.
+# Port 0 disables it. The default address only accepts local connections.
+metricsServer.addr = "127.0.0.1"
+metricsServer.port = 0
+# Credentials and TLS are independent of webServer; /healthz stays anonymous.
+# metricsServer.user = "monitor"
+# metricsServer.password = "change-me"
+# metricsServer.tls.certFile = "metrics.crt"
+# metricsServer.tls.keyFile = "metrics.key"
+# Profiling requires explicit opt-in, uses the above credentials, and excludes cmdline.
+metricsServer.pprofEnable = false
+
 # The maximum amount of time a dial to server will wait for a connect to complete. Default value is 10 seconds.
 # transport.dialServerTimeout = 10
 

conf/frps_full_example.toml

@@ -75,13 +75,27 @@ webServer.password = "admin"
 # dashboard assets directory(only for debug mode)
 # webServer.assetsDir = "./static"
 
+# Deprecated: use metricsServer.pprofEnable for authenticated profiling.
 # Enable golang pprof handlers in dashboard listener.
 # Dashboard port must be set first
 webServer.pprofEnable = false
 
-# enablePrometheus will export prometheus metrics on webServer in /metrics api.
+# Deprecated: enablePrometheus exports /metrics on webServer only.
+# Use metricsServer.port instead; it enables business metrics automatically.
 enablePrometheus = true
 
+# Separate health, Prometheus metrics, and optional profiling listener.
+# Port 0 disables it. The default address only accepts local connections.
+metricsServer.addr = "127.0.0.1"
+metricsServer.port = 0
+# Credentials and TLS are independent of webServer; /healthz stays anonymous.
+# metricsServer.user = "monitor"
+# metricsServer.password = "change-me"
+# metricsServer.tls.certFile = "metrics.crt"
+# metricsServer.tls.keyFile = "metrics.key"
+# Profiling requires explicit opt-in, uses the above credentials, and excludes cmdline.
+metricsServer.pprofEnable = false
+
 # console or real logFile path like ./frps.log
 log.to = "./frps.log"
 # trace, debug, info, warn, error

pkg/config/v1/client.go

@@ -60,10 +60,11 @@ type ClientCommonConfig struct {
 	// set.
 	Start []string `json:"start,omitempty"`
 
-	Log        LogConfig             `json:"log,omitempty"`
+	Log           LogConfig             `json:"log,omitempty"`
-	WebServer  WebServerConfig       `json:"webServer,omitempty"`
+	WebServer     WebServerConfig       `json:"webServer,omitempty"`
-	Transport  ClientTransportConfig `json:"transport,omitempty"`
+	MetricsServer MetricsServerConfig   `json:"metricsServer,omitempty"`
-	VirtualNet VirtualNetConfig      `json:"virtualNet,omitempty"`
+	Transport     ClientTransportConfig `json:"transport,omitempty"`
+	VirtualNet    VirtualNetConfig      `json:"virtualNet,omitempty"`
 
 	// FeatureGates specifies a set of feature gates to enable or disable.
 	// This can be used to enable alpha/beta features or disable default features.
@@ -94,6 +95,7 @@ func (c *ClientCommonConfig) Complete() error {
 	c.Log.Complete()
 	c.Transport.Complete()
 	c.WebServer.Complete()
+	c.MetricsServer.Complete()
 
 	c.UDPPacketSize = util.EmptyOr(c.UDPPacketSize, 1500)
 	return nil

pkg/config/v1/common.go

@@ -72,6 +72,26 @@ func (c *WebServerConfig) Complete() {
 	c.Addr = util.EmptyOr(c.Addr, "127.0.0.1")
 }
 
+// MetricsServerConfig configures a separate listener for health checks, metrics
+// (frps only), and optional pprof handlers. It does not serve the web interface.
+type MetricsServerConfig struct {
+	// Addr defaults to "127.0.0.1".
+	Addr string `json:"addr,omitempty"`
+	// Port disables the listener when set to 0.
+	Port int `json:"port,omitempty"`
+	// User and Password protect metrics and pprof; health checks remain anonymous.
+	User     string `json:"user,omitempty"`
+	Password string `json:"password,omitempty"`
+	// PprofEnable explicitly enables profiling, excluding cmdline.
+	PprofEnable bool `json:"pprofEnable,omitempty"`
+	// Enable TLS if TLS is not nil.
+	TLS *TLSConfig `json:"tls,omitempty"`
+}
+
+func (c *MetricsServerConfig) Complete() {
+	c.Addr = util.EmptyOr(c.Addr, "127.0.0.1")
+}
+
 type TLSConfig struct {
 	// CertFile specifies the path of the cert file that client will load.
 	CertFile string `json:"certFile,omitempty"`

pkg/config/v1/server.go

@@ -69,7 +69,8 @@ type ServerConfig struct {
 
 	SSHTunnelGateway SSHTunnelGateway `json:"sshTunnelGateway,omitempty"`
 
-	WebServer WebServerConfig `json:"webServer,omitempty"`
+	WebServer     WebServerConfig     `json:"webServer,omitempty"`
+	MetricsServer MetricsServerConfig `json:"metricsServer,omitempty"`
 	// EnablePrometheus will export prometheus metrics on webserver address
 	// in /metrics api.
 	EnablePrometheus bool `json:"enablePrometheus,omitempty"`
@@ -105,6 +106,7 @@ func (c *ServerConfig) Complete() error {
 	c.Log.Complete()
 	c.Transport.Complete()
 	c.WebServer.Complete()
+	c.MetricsServer.Complete()
 	c.SSHTunnelGateway.Complete()
 
 	c.BindAddr = util.EmptyOr(c.BindAddr, "0.0.0.0")

pkg/config/v1/validation/client.go

@@ -38,6 +38,7 @@ func (v *ConfigValidator) ValidateClientCommonConfig(c *v1.ClientCommonConfig) (
 		func() (Warning, error) { return v.validateAuthConfig(&c.Auth) },
 		func() (Warning, error) { return nil, validateLogConfig(&c.Log) },
 		func() (Warning, error) { return nil, validateWebServerConfig(&c.WebServer) },
+		func() (Warning, error) { return nil, validateMetricsServerConfig(&c.MetricsServer, &c.WebServer) },
 		func() (Warning, error) { return validateTransportConfig(&c.Transport) },
 		func() (Warning, error) { return validateIncludeFiles(c.IncludeConfigFiles) },
 	}

pkg/config/v1/validation/common.go

@@ -37,6 +37,27 @@ func validateWebServerConfig(c *v1.WebServerConfig) error {
 	return ValidatePort(c.Port, "webServer.port")
 }
 
+func validateMetricsServerConfig(c *v1.MetricsServerConfig, web *v1.WebServerConfig) error {
+	if err := ValidatePort(c.Port, "metricsServer.port"); err != nil {
+		return err
+	}
+	if c.TLS != nil {
+		if c.TLS.UseSystemCa {
+			return fmt.Errorf("metricsServer.tls.useSystemCa is only supported in frpc transport.tls")
+		}
+		if c.TLS.CertFile == "" || c.TLS.KeyFile == "" {
+			return fmt.Errorf("metricsServer.tls.certFile and metricsServer.tls.keyFile must both be specified when tls is enabled")
+		}
+	}
+	// Only reject an exact duplicate. Whether two different addresses can share
+	// a port depends on the address family and the platform, so leave it to
+	// net.Listen to decide.
+	if c.Port > 0 && web.Port > 0 && c.Port == web.Port && c.Addr == web.Addr {
+		return fmt.Errorf("metricsServer.addr:port conflicts with webServer.addr:port")
+	}
+	return nil
+}
+
 // ValidatePort checks that the network port is in range
 func ValidatePort(port int, fieldPath string) error {
 	if 0 <= port && port <= 65535 {

pkg/config/v1/validation/metrics_server_test.go

@@ -0,0 +1,119 @@
+// Copyright 2026 The frp Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package validation
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	v1 "github.com/fatedier/frp/pkg/config/v1"
+)
+
+func TestValidateMetricsServerConfig(t *testing.T) {
+	for _, tc := range []struct {
+		name    string
+		metrics v1.MetricsServerConfig
+		web     v1.WebServerConfig
+		wantErr string
+	}{
+		{name: "disabled"},
+		{name: "negative port", metrics: v1.MetricsServerConfig{Port: -1}, wantErr: "metricsServer.port"},
+		{name: "overflow port", metrics: v1.MetricsServerConfig{Port: 65536}, wantErr: "metricsServer.port"},
+		{name: "maximum port", metrics: v1.MetricsServerConfig{Port: 65535}},
+		{name: "empty TLS", metrics: v1.MetricsServerConfig{TLS: &v1.TLSConfig{}}, wantErr: "metricsServer.tls.certFile"},
+		{name: "only certificate", metrics: v1.MetricsServerConfig{TLS: &v1.TLSConfig{CertFile: "cert"}}, wantErr: "metricsServer.tls.keyFile"},
+		{name: "only key", metrics: v1.MetricsServerConfig{TLS: &v1.TLSConfig{KeyFile: "key"}}, wantErr: "metricsServer.tls.certFile"},
+		{name: "TLS pair", metrics: v1.MetricsServerConfig{TLS: &v1.TLSConfig{CertFile: "cert", KeyFile: "key"}}},
+		{name: "system CA", metrics: v1.MetricsServerConfig{TLS: &v1.TLSConfig{UseSystemCa: true}}, wantErr: "metricsServer.tls.useSystemCa"},
+		{
+			name: "same address", metrics: v1.MetricsServerConfig{Addr: "127.0.0.1", Port: 7501},
+			web: v1.WebServerConfig{Addr: "127.0.0.1", Port: 7501}, wantErr: "conflicts with webServer",
+		},
+		{
+			name: "different addresses", metrics: v1.MetricsServerConfig{Addr: "127.0.0.1", Port: 7501},
+			web: v1.WebServerConfig{Addr: "127.0.0.2", Port: 7501},
+		},
+		{
+			name: "different ports", metrics: v1.MetricsServerConfig{Port: 7501},
+			web: v1.WebServerConfig{Port: 7500},
+		},
+		{
+			name: "web disabled", metrics: v1.MetricsServerConfig{Port: 7501},
+		},
+		{
+			name: "metrics disabled", web: v1.WebServerConfig{Port: 7501},
+		},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			checkMetricsConfigBoth(t, tc.metrics, tc.web, tc.wantErr)
+		})
+	}
+	// Two different addresses on the same port may or may not coexist depending
+	// on the address family and the platform, so only an exact duplicate is a
+	// configuration error here.
+	for _, wildcard := range []string{"", "0.0.0.0", "::"} {
+		t.Run("wildcard "+wildcard+" with loopback", func(t *testing.T) {
+			checkMetricsConfigBoth(t, v1.MetricsServerConfig{Addr: wildcard, Port: 7501},
+				v1.WebServerConfig{Addr: "127.0.0.1", Port: 7501}, "")
+			checkMetricsConfigBoth(t, v1.MetricsServerConfig{Addr: "127.0.0.1", Port: 7501},
+				v1.WebServerConfig{Addr: wildcard, Port: 7501}, "")
+		})
+		t.Run("same wildcard "+wildcard, func(t *testing.T) {
+			checkMetricsConfigBoth(t, v1.MetricsServerConfig{Addr: wildcard, Port: 7501},
+				v1.WebServerConfig{Addr: wildcard, Port: 7501}, "conflicts with webServer")
+		})
+	}
+	t.Run("different wildcards on the same port", func(t *testing.T) {
+		checkMetricsConfigBoth(t, v1.MetricsServerConfig{Addr: "0.0.0.0", Port: 7501},
+			v1.WebServerConfig{Addr: "::", Port: 7501}, "")
+	})
+}
+
+func checkMetricsConfigBoth(t *testing.T, metrics v1.MetricsServerConfig, web v1.WebServerConfig, wantErr string) {
+	t.Helper()
+	server := &v1.ServerConfig{}
+	client := &v1.ClientCommonConfig{}
+	require.NoError(t, server.Complete())
+	require.NoError(t, client.Complete())
+	// Assign after completion to also check raw empty (wildcard) addresses.
+	server.MetricsServer, server.WebServer = metrics, web
+	client.MetricsServer, client.WebServer = metrics, web
+	validator := NewConfigValidator(nil)
+	_, serverErr := validator.ValidateServerConfig(server)
+	_, clientErr := validator.ValidateClientCommonConfig(client)
+	for _, err := range []error{serverErr, clientErr} {
+		if wantErr == "" {
+			require.NoError(t, err)
+		} else {
+			require.ErrorContains(t, err, wantErr)
+			require.ErrorContains(t, err, "metricsServer")
+		}
+	}
+}
+
+func TestMetricsServerDefaults(t *testing.T) {
+	for _, port := range []int{0, 7501} {
+		server := &v1.ServerConfig{MetricsServer: v1.MetricsServerConfig{Port: port}}
+		client := &v1.ClientCommonConfig{MetricsServer: v1.MetricsServerConfig{Port: port}}
+		require.NoError(t, server.Complete())
+		require.NoError(t, client.Complete())
+		for _, cfg := range []v1.MetricsServerConfig{server.MetricsServer, client.MetricsServer} {
+			require.Equal(t, "127.0.0.1", cfg.Addr)
+			require.Equal(t, port, cfg.Port)
+			require.False(t, cfg.PprofEnable)
+		}
+	}
+}

pkg/config/v1/validation/server.go

@@ -44,6 +44,9 @@ func (v *ConfigValidator) ValidateServerConfig(c *v1.ServerConfig) (Warning, err
 	if err := validateWebServerConfig(&c.WebServer); err != nil {
 		errs = AppendError(errs, err)
 	}
+	if err := validateMetricsServerConfig(&c.MetricsServer, &c.WebServer); err != nil {
+		errs = AppendError(errs, err)
+	}
 	if c.Transport.TLS.UseSystemCa {
 		errs = AppendError(errs, fmt.Errorf("transport.tls.useSystemCa is only supported in frpc transport.tls"))
 	}

pkg/util/http/metrics_server.go

@@ -0,0 +1,54 @@
+// Copyright 2026 The frp Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package http
+
+import (
+	"net/http"
+	"net/http/pprof"
+
+	v1 "github.com/fatedier/frp/pkg/config/v1"
+)
+
+// NewMetricsServer creates a listener with only health, optional metrics, and
+// opt-in profiling endpoints. A zero port disables it and returns a nil server.
+func NewMetricsServer(cfg v1.MetricsServerConfig, metricsHandler http.Handler) (*Server, error) {
+	if cfg.Port == 0 {
+		return nil, nil
+	}
+	s, err := newServer(cfg.Addr, cfg.Port, cfg.User, cfg.Password, cfg.TLS)
+	if err != nil {
+		return nil, err
+	}
+	s.router.HandleFunc("/healthz", func(w http.ResponseWriter, _ *http.Request) {
+		w.WriteHeader(http.StatusOK)
+	})
+	authed := s.router.NewRoute().Subrouter()
+	authed.Use(s.authMiddleware)
+	if metricsHandler != nil {
+		authed.Handle("/metrics", metricsHandler)
+	}
+	if cfg.PprofEnable {
+		// Use exact routes rather than a prefix so cmdline and unknown endpoints
+		// cannot reach pprof.Index's fallback dispatch.
+		authed.HandleFunc("/debug/pprof/", pprof.Index)
+		authed.HandleFunc("/debug/pprof/profile", pprof.Profile)
+		authed.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
+		authed.HandleFunc("/debug/pprof/trace", pprof.Trace)
+		for _, name := range []string{"allocs", "block", "goroutine", "heap", "mutex", "threadcreate"} {
+			authed.Handle("/debug/pprof/"+name, pprof.Handler(name))
+		}
+	}
+	return s, nil
+}

pkg/util/http/metrics_server_test.go

@@ -0,0 +1,111 @@
+// Copyright 2026 The frp Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package http
+
+import (
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/fatedier/frp/assets"
+	v1 "github.com/fatedier/frp/pkg/config/v1"
+)
+
+func newTestMetricsServer(t *testing.T, pprofEnabled bool, handler http.Handler) *Server {
+	t.Helper()
+	ln, err := net.Listen("tcp", "127.0.0.1:0")
+	require.NoError(t, err)
+	port := ln.Addr().(*net.TCPAddr).Port
+	require.NoError(t, ln.Close())
+	s, err := NewMetricsServer(v1.MetricsServerConfig{
+		Addr: "127.0.0.1", Port: port, User: "monitor", Password: "secret", PprofEnable: pprofEnabled,
+	}, handler)
+	require.NoError(t, err)
+	t.Cleanup(func() { require.NoError(t, s.Close()) })
+	return s
+}
+
+func TestMetricsServerRoutes(t *testing.T) {
+	for _, enabled := range []bool{false, true} {
+		name := "pprof disabled"
+		if enabled {
+			name = "pprof enabled"
+		}
+		t.Run(name, func(t *testing.T) {
+			calls := 0
+			s := newTestMetricsServer(t, enabled, http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+				calls++
+				_, _ = w.Write([]byte("business metrics"))
+			}))
+			for _, authed := range []bool{false, true} {
+				for _, path := range []string{
+					"/healthz", "/metrics", "/debug/pprof/", "/debug/pprof/goroutine",
+					"/debug/pprof/cmdline", "/debug/pprof/unknown", "/", "/static/app.js", "/api/serverinfo", "/api/config",
+				} {
+					req := httptest.NewRequest(http.MethodGet, path, nil)
+					if authed {
+						req.SetBasicAuth("monitor", "secret")
+					}
+					resp := httptest.NewRecorder()
+					s.router.ServeHTTP(resp, req)
+					expected := http.StatusNotFound
+					switch path {
+					case "/healthz":
+						expected = http.StatusOK
+						require.Empty(t, resp.Body.String())
+					case "/metrics":
+						expected = http.StatusUnauthorized
+						if authed {
+							expected = http.StatusOK
+							require.Equal(t, "business metrics", resp.Body.String())
+						}
+					case "/debug/pprof/", "/debug/pprof/goroutine":
+						if enabled {
+							expected = http.StatusUnauthorized
+							if authed {
+								expected = http.StatusOK
+							}
+						}
+					}
+					require.Equal(t, expected, resp.Code, "path=%s authenticated=%v", path, authed)
+				}
+			}
+			require.Equal(t, 1, calls, "unauthenticated requests must not reach the metrics handler")
+		})
+	}
+}
+
+func TestMetricsServerWithoutMetricsPreservesAssets(t *testing.T) {
+	assets.Load(t.TempDir())
+	before := assets.FileSystem
+	t.Cleanup(func() { assets.Load("") })
+	s := newTestMetricsServer(t, false, nil)
+	// assets.Load uses http.Dir for local assets, a value rather than a pointer.
+	require.Equal(t, before, assets.FileSystem)
+	req := httptest.NewRequest(http.MethodGet, "/metrics", nil)
+	req.SetBasicAuth("monitor", "secret")
+	resp := httptest.NewRecorder()
+	s.router.ServeHTTP(resp, req)
+	require.Equal(t, http.StatusNotFound, resp.Code)
+}
+
+func TestMetricsServerDisabled(t *testing.T) {
+	s, err := NewMetricsServer(v1.MetricsServerConfig{TLS: &v1.TLSConfig{CertFile: "nonexistent"}}, nil)
+	require.NoError(t, err)
+	require.Nil(t, s)
+}

pkg/util/http/server.go

@@ -48,7 +48,18 @@ type Server struct {
 func NewServer(cfg v1.WebServerConfig) (*Server, error) {
 	assets.Load(cfg.AssetsDir)
 
-	addr := net.JoinHostPort(cfg.Addr, strconv.Itoa(cfg.Port))
+	s, err := newServer(cfg.Addr, cfg.Port, cfg.User, cfg.Password, cfg.TLS)
+	if err != nil {
+		return nil, err
+	}
+	if cfg.PprofEnable {
+		s.registerPprofHandlers()
+	}
+	return s, nil
+}
+
+func newServer(bindAddr string, port int, user, password string, tlsConfig *v1.TLSConfig) (*Server, error) {
+	addr := net.JoinHostPort(bindAddr, strconv.Itoa(port))
 	if addr == ":" {
 		addr = ":http"
 	}
@@ -65,11 +76,8 @@ func NewServer(cfg v1.WebServerConfig) (*Server, error) {
 		hs:     hs,
 		router: router,
 	}
-	if cfg.PprofEnable {
+	if tlsConfig != nil {
-		s.registerPprofHandlers()
+		cert, err := tls.LoadX509KeyPair(tlsConfig.CertFile, tlsConfig.KeyFile)
-	}
-	if cfg.TLS != nil {
-		cert, err := tls.LoadX509KeyPair(cfg.TLS.CertFile, cfg.TLS.KeyFile)
 		if err != nil {
 			return nil, err
 		}
@@ -77,7 +85,7 @@ func NewServer(cfg v1.WebServerConfig) (*Server, error) {
 			Certificates: []tls.Certificate{cert},
 		}
 	}
-	s.authMiddleware = netpkg.NewHTTPAuthMiddleware(cfg.User, cfg.Password).SetAuthFailDelay(200 * time.Millisecond).Middleware
+	s.authMiddleware = netpkg.NewHTTPAuthMiddleware(user, password).SetAuthFailDelay(200 * time.Millisecond).Middleware
 
 	// Bind only after all fallible preparation so an error cannot leak the listener.
 	ln, err := net.Listen("tcp", addr)

server/metrics_server_test.go

@@ -0,0 +1,108 @@
+// Copyright 2026 The frp Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package server
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+
+	v1 "github.com/fatedier/frp/pkg/config/v1"
+)
+
+func TestServiceMetricsServerWithoutWebServer(t *testing.T) {
+	cfg := &v1.ServerConfig{
+		BindAddr: "127.0.0.1", ProxyBindAddr: "127.0.0.1",
+		MetricsServer: v1.MetricsServerConfig{Port: freeLifecycleTCPPort(t)},
+	}
+	require.NoError(t, cfg.Complete())
+	cfg.BindPort = 0
+	svr, err := NewService(cfg)
+	require.NoError(t, err)
+	require.Nil(t, svr.webServer)
+	address := svr.metricsServer.Address()
+	done := make(chan struct{})
+	go func() { svr.Run(context.Background()); close(done) }()
+	defer func() {
+		require.NoError(t, svr.Close())
+		waitForSignal(t, done, "metrics service shutdown")
+		assertLifecyclePorts(t, []string{address}, true)
+	}()
+
+	client := &http.Client{Timeout: 3 * time.Second}
+	resp, err := client.Get("http://" + address + "/healthz")
+	require.NoError(t, err)
+	defer resp.Body.Close()
+	require.Equal(t, http.StatusOK, resp.StatusCode)
+	body, err := io.ReadAll(resp.Body)
+	require.NoError(t, err)
+	require.Empty(t, body)
+}
+
+func TestNewServiceReleasesResourcesOnMetricsServerFailure(t *testing.T) {
+	for _, mode := range []string{"port conflict", "invalid TLS certificate"} {
+		t.Run(mode, func(t *testing.T) {
+			cfg := &v1.ServerConfig{BindAddr: "127.0.0.1", ProxyBindAddr: "127.0.0.1"}
+			require.NoError(t, cfg.Complete())
+			// Reserve distinct ports together, including the second HTTP listener.
+			ports := []*int{&cfg.BindPort, &cfg.VhostHTTPPort, &cfg.WebServer.Port, &cfg.MetricsServer.Port}
+			reservations := make([]net.Listener, 0, len(ports))
+			addresses := make([]string, 0, len(ports))
+			for _, port := range ports {
+				ln, err := net.Listen("tcp", "127.0.0.1:0")
+				require.NoError(t, err)
+				t.Cleanup(func() { _ = ln.Close() })
+				*port = ln.Addr().(*net.TCPAddr).Port
+				reservations = append(reservations, ln)
+				addresses = append(addresses, ln.Addr().String())
+			}
+			for _, ln := range reservations[:len(reservations)-1] {
+				require.NoError(t, ln.Close())
+			}
+			if mode == "invalid TLS certificate" {
+				require.NoError(t, reservations[len(reservations)-1].Close())
+				cfg.MetricsServer.TLS = &v1.TLSConfig{
+					CertFile: filepath.Join(t.TempDir(), "missing.crt"), KeyFile: "missing.key",
+				}
+			} else {
+				// This port belongs to the test, not to the failed service.
+				addresses = addresses[:len(addresses)-1]
+			}
+			workersBefore := countPortManagerWorkers(t)
+			for range 5 {
+				svr, err := NewService(cfg)
+				if svr != nil {
+					_ = svr.Close()
+				}
+				require.Error(t, err)
+				require.Nil(t, svr)
+				if mode == "port conflict" {
+					require.ErrorContains(t, err, fmt.Sprint(cfg.MetricsServer.Port))
+				} else {
+					require.ErrorContains(t, err, "missing.crt")
+				}
+				assertLifecyclePorts(t, addresses, true)
+			}
+			require.Equal(t, workersBefore, countPortManagerWorkers(t), "failed construction leaked port-manager workers")
+		})
+	}
+}

server/service.go

@@ -31,6 +31,7 @@ import (
 	"github.com/fatedier/golib/crypto"
 	"github.com/fatedier/golib/net/mux"
 	fmux "github.com/fatedier/yamux"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
 	quic "github.com/quic-go/quic-go"
 	"github.com/samber/lo"
 
@@ -120,7 +121,8 @@ type Service struct {
 	rc *controller.ResourceController
 
 	// web server for dashboard UI and apis
-	webServer *httppkg.Server
+	webServer     *httppkg.Server
+	metricsServer *httppkg.Server
 	// HTTP vhost resources are started and owned by NewService.
 	httpVhostServer   *http.Server
 	httpVhostListener net.Listener
@@ -347,8 +349,8 @@ func NewService(cfg *v1.ServerConfig) (*Service, error) {
 	}
 	svr.rc.NatHoleController = nc
 
-	// Create the web server after all fallible steps so its listener is not
+	// Create HTTP servers after all other fallible steps, rolling back listeners
-	// leaked when an earlier error causes NewService to return.
+	// if either server cannot be created.
 	if cfg.WebServer.Port > 0 {
 		ws, err := httppkg.NewServer(cfg.WebServer)
 		if err != nil {
@@ -357,11 +359,24 @@ func NewService(cfg *v1.ServerConfig) (*Service, error) {
 			return nil, err
 		}
 		svr.webServer = ws
-
+	}
-		modelmetrics.EnableMem()
+	if cfg.MetricsServer.Port > 0 {
-		if cfg.EnablePrometheus {
+		ms, err := httppkg.NewMetricsServer(cfg.MetricsServer, promhttp.Handler())
-			modelmetrics.EnablePrometheus()
+		if err != nil {
+			_ = svr.Close()
+			return nil, err
 		}
+		svr.metricsServer = ms
+	}
+
+	// Collectors are enabled at most once. The in-memory collector is only read
+	// by the dashboard API, and Prometheus metrics need an endpoint to serve them.
+	enableMem, enablePrometheus := metricsCollectors(cfg)
+	if enableMem {
+		modelmetrics.EnableMem()
+	}
+	if enablePrometheus {
+		modelmetrics.EnablePrometheus()
 	}
 
 	// Start port-manager cleanup workers only after all fallible steps have succeeded.
@@ -375,6 +390,16 @@ func NewService(cfg *v1.ServerConfig) (*Service, error) {
 	return svr, nil
 }
 
+// metricsCollectors reports which collectors should be started for cfg. The
+// in-memory collector only backs the dashboard API (webServer), while the
+// Prometheus collector needs a listener that serves /metrics: either the new
+// metricsServer, or the legacy webServer endpoint gated by enablePrometheus.
+func metricsCollectors(cfg *v1.ServerConfig) (mem bool, prometheus bool) {
+	mem = cfg.WebServer.Port > 0
+	prometheus = cfg.MetricsServer.Port > 0 || (cfg.EnablePrometheus && mem)
+	return mem, prometheus
+}
+
 func (svr *Service) Run(ctx context.Context) {
 	ctx, cancel := context.WithCancel(ctx)
 	svr.lifecycleMu.Lock()
@@ -396,6 +421,15 @@ func (svr *Service) Run(ctx context.Context) {
 
 	// run dashboard web server.
 	if svr.webServer != nil {
+		if svr.cfg.WebServer.PprofEnable {
+			log.Warnf("webServer pprof endpoints are deprecated; use metricsServer.pprofEnable instead")
+		}
+		if svr.cfg.EnablePrometheus {
+			log.Warnf("webServer /metrics is deprecated; configure metricsServer.port instead")
+		}
+		if svr.cfg.MetricsServer.Port == 0 {
+			log.Infof("webServer /healthz is deprecated; health probes can migrate to metricsServer.port")
+		}
 		go func() {
 			log.Infof("dashboard listen on %s", svr.webServer.Address())
 			if err := svr.webServer.Run(); err != nil {
@@ -404,6 +438,15 @@ func (svr *Service) Run(ctx context.Context) {
 		}()
 	}
 
+	if svr.metricsServer != nil {
+		go func() {
+			log.Infof("metrics server listen on %s", svr.metricsServer.Address())
+			if err := svr.metricsServer.Run(); err != nil && !errors.Is(err, http.ErrServerClosed) {
+				log.Warnf("metrics server exit with error: %v", err)
+			}
+		}()
+	}
+
 	go svr.HandleListener(svr.sshTunnelListener, true)
 
 	if svr.kcpListener != nil {
@@ -462,6 +505,9 @@ func (svr *Service) closeResources() {
 	if svr.webServer != nil {
 		svr.webServer.Close()
 	}
+	if svr.metricsServer != nil {
+		svr.metricsServer.Close()
+	}
 	if svr.httpVhostServer != nil {
 		svr.httpVhostServer.Close()
 		// Close even if Serve has not registered its listener yet.

server/service_lifecycle_test.go

@@ -276,6 +276,50 @@ func TestServiceRunAfterEarlyShutdown(t *testing.T) {
 	}
 }
 
+func TestMetricsCollectors(t *testing.T) {
+	for _, tc := range []struct {
+		name                    string
+		webPort, metricsPort    int
+		enablePrometheus        bool
+		wantMem, wantPrometheus bool
+	}{
+		{name: "nothing enabled"},
+		{name: "web server only", webPort: 7500, wantMem: true},
+		{
+			name: "web server with enablePrometheus", webPort: 7500, enablePrometheus: true,
+			wantMem: true, wantPrometheus: true,
+		},
+		{
+			// enablePrometheus alone has no endpoint to serve metrics from, so the
+			// Prometheus collector must stay off, as it did before metricsServer.
+			name: "enablePrometheus without listeners", enablePrometheus: true,
+		},
+		{
+			// The in-memory collector only backs the dashboard API.
+			name: "metrics server only", metricsPort: 7501, wantPrometheus: true,
+		},
+		{
+			name: "both servers", webPort: 7500, metricsPort: 7501,
+			wantMem: true, wantPrometheus: true,
+		},
+		{
+			name: "both servers with enablePrometheus", webPort: 7500, metricsPort: 7501, enablePrometheus: true,
+			wantMem: true, wantPrometheus: true,
+		},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			cfg := &v1.ServerConfig{
+				WebServer:        v1.WebServerConfig{Port: tc.webPort},
+				MetricsServer:    v1.MetricsServerConfig{Port: tc.metricsPort},
+				EnablePrometheus: tc.enablePrometheus,
+			}
+			mem, prometheus := metricsCollectors(cfg)
+			require.Equal(t, tc.wantMem, mem, "EnableMem")
+			require.Equal(t, tc.wantPrometheus, prometheus, "EnablePrometheus")
+		})
+	}
+}
+
 func TestServiceCloseMarksClosedBeforeCleanup(t *testing.T) {
 	svr, listener, addresses := newLifecycleTestService(t, false)
 	listener.closeEntered, listener.closeResume = make(chan struct{}), make(chan struct{})

test/e2e/v1/features/metrics_server.go

@@ -0,0 +1,124 @@
+package features
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/onsi/ginkgo/v2"
+	"github.com/onsi/gomega"
+
+	"github.com/fatedier/frp/server/http/model"
+	"github.com/fatedier/frp/test/e2e/framework"
+	"github.com/fatedier/frp/test/e2e/framework/consts"
+	"github.com/fatedier/frp/test/e2e/pkg/request"
+)
+
+func metricsServerConfig(port int, pprof bool) string {
+	return fmt.Sprintf(`
+metricsServer.port = %d
+metricsServer.user = "monitor"
+metricsServer.password = "secret"
+metricsServer.pprofEnable = %t
+`, port, pprof)
+}
+
+func metricsRequest(port int, path string, authenticated bool) *request.Request {
+	r := framework.NewRequest().HTTP().Port(port).HTTPPath(path)
+	if authenticated {
+		r.HTTPAuth("monitor", "secret")
+	}
+	return r
+}
+
+var _ = ginkgo.Describe("[Feature: Metrics Server]", func() {
+	f := framework.NewDefaultFramework()
+
+	// A single connected client must produce exactly one event, including when
+	// both listeners expose /metrics. Checking names alone would also pass with
+	// registered collectors that never receive business events.
+	expectBusinessMetrics := func(port int) {
+		gomega.Eventually(func() bool {
+			resp, err := metricsRequest(port, "/metrics", true).Do()
+			return err == nil && resp.Code == http.StatusOK &&
+				strings.Contains(string(resp.Content), "\nfrp_server_client_counts 1\n")
+		}, 5*time.Second, 50*time.Millisecond).Should(gomega.BeTrue())
+	}
+
+	ginkgo.It("serves anonymous health alongside both web servers", func() {
+		serverMetrics, clientMetrics := f.AllocPort(), f.AllocPort()
+		serverWeb, clientWeb := f.AllocPort(), f.AllocPort()
+		webConfig := func(port int) string {
+			return fmt.Sprintf(`
+webServer.port = %d
+webServer.user = "admin"
+webServer.password = "admin-secret"
+`, port)
+		}
+		serverConf := consts.DefaultServerConfig + metricsServerConfig(serverMetrics, false) + webConfig(serverWeb)
+		clientConf := consts.DefaultClientConfig + metricsServerConfig(clientMetrics, false) + webConfig(clientWeb)
+		f.RunProcesses(serverConf, []string{clientConf})
+		for _, port := range []int{serverMetrics, clientMetrics, serverWeb, clientWeb} {
+			framework.NewRequestExpect(f).Request(metricsRequest(port, "/healthz", false)).ExpectResp([]byte("")).
+				Ensure(framework.ExpectResponseCode(http.StatusOK), func(resp *request.Response) bool { return len(resp.Content) == 0 })
+		}
+		for _, port := range []int{serverMetrics, clientMetrics} {
+			for _, path := range []string{"/", "/api/serverinfo", "/api/config", "/static/app.js"} {
+				framework.NewRequestExpect(f).Request(metricsRequest(port, path, true)).Ensure(framework.ExpectResponseCode(http.StatusNotFound))
+			}
+		}
+	})
+
+	ginkgo.It("authenticates business metrics without enablePrometheus", func() {
+		port := f.AllocPort()
+		serverConf := consts.DefaultServerConfig + metricsServerConfig(port, false) + fmt.Sprintf("\nwebServer.port = %d\n", f.AllocPort())
+		f.RunProcesses(serverConf, []string{consts.DefaultClientConfig})
+		framework.NewRequestExpect(f).Request(metricsRequest(port, "/metrics", false)).Ensure(framework.ExpectResponseCode(http.StatusUnauthorized))
+		expectBusinessMetrics(port)
+	})
+
+	ginkgo.It("requires opt-in and authentication for pprof and excludes cmdline", func() {
+		serverPort, clientPort := f.AllocPort(), f.AllocPort()
+		f.RunProcesses(consts.DefaultServerConfig+metricsServerConfig(serverPort, true),
+			[]string{consts.DefaultClientConfig + metricsServerConfig(clientPort, false)})
+		for _, path := range []string{"/debug/pprof/", "/debug/pprof/goroutine"} {
+			framework.NewRequestExpect(f).Request(metricsRequest(serverPort, path, false)).Ensure(framework.ExpectResponseCode(http.StatusUnauthorized))
+			framework.NewRequestExpect(f).Request(metricsRequest(serverPort, path, true)).Ensure(framework.ExpectResponseCode(http.StatusOK))
+			framework.NewRequestExpect(f).Request(metricsRequest(clientPort, path, true)).Ensure(framework.ExpectResponseCode(http.StatusNotFound))
+		}
+		for _, authenticated := range []bool{false, true} {
+			framework.NewRequestExpect(f).Request(metricsRequest(serverPort, "/debug/pprof/cmdline", authenticated)).
+				Ensure(framework.ExpectResponseCode(http.StatusNotFound))
+		}
+	})
+
+	ginkgo.It("serves health and business metrics without either web server", func() {
+		serverPort, clientPort := f.AllocPort(), f.AllocPort()
+		f.RunProcesses(consts.DefaultServerConfig+metricsServerConfig(serverPort, false),
+			[]string{consts.DefaultClientConfig + metricsServerConfig(clientPort, false)})
+		for _, port := range []int{serverPort, clientPort} {
+			framework.NewRequestExpect(f).Request(metricsRequest(port, "/healthz", false)).Ensure(framework.ExpectResponseCode(http.StatusOK))
+		}
+		expectBusinessMetrics(serverPort)
+		framework.NewRequestExpect(f).Request(metricsRequest(clientPort, "/metrics", true)).Ensure(framework.ExpectResponseCode(http.StatusNotFound))
+	})
+
+	ginkgo.It("collects once when both metrics endpoints are enabled", func() {
+		metricsPort, webPort := f.AllocPort(), f.AllocPort()
+		serverConf := consts.DefaultServerConfig + metricsServerConfig(metricsPort, false) + fmt.Sprintf(`
+enablePrometheus = true
+webServer.port = %d
+webServer.user = "monitor"
+webServer.password = "secret"
+`, webPort)
+		f.RunProcesses(serverConf, []string{consts.DefaultClientConfig})
+		expectBusinessMetrics(metricsPort)
+		expectBusinessMetrics(webPort)
+		framework.NewRequestExpect(f).Request(metricsRequest(webPort, "/api/serverinfo", true)).Ensure(func(resp *request.Response) bool {
+			var info model.ServerInfoResp
+			return resp.Code == http.StatusOK && json.Unmarshal(resp.Content, &info) == nil && info.ClientCounts == 1
+		})
+	})
+})