Add pkg/metrics/text, a small Prometheus text-format writer, and use it
for frpc's /metrics. The endpoint lives only on metricsServer and is
covered by its Basic Auth, like the other endpoints there.
The package emits the Go runtime families and, on Linux, the process
families read from /proc. Their names, types and help strings match
client_golang's default collectors, so existing Go runtime dashboards
keep working. It deliberately emits no frp_ business metrics and none of
client_golang's promhttp_ handler metrics.
Writing the subset ourselves keeps client_golang and protobuf out of the
frpc binary; both are still used by frps and by the tests here.
Remove 4 redundant pointer map write-backs in OpenConnection,
CloseConnection, AddTrafficIn, and AddTrafficOut since the map stores
pointers and mutations are already visible without reassignment.
Optimize GetProxiesByTypeAndName from O(n) full map scan to O(1) direct
map lookup by proxy name.
- Replace duplicate parseBasicAuth with existing httppkg.ParseBasicAuth
- Extract buildDomains helper in BaseProxy for HTTP/HTTPS/TCPMux proxies
- Extract toProxyStats helper to deduplicate ProxyStats construction
- Extract startVisitorListener helper in BaseProxy for STCP/SUDP proxies
- Extract acceptLoop helper in BaseVisitor for STCP/XTCP visitors
* add proxy name label to the proxy_count metric
* undo label addition in favor of a new metric - this change should not break existing queries
* also register this new metric
* add type label to proxy_counts_detailed
* Update pkg/metrics/prometheus/server.go
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
---------
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
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