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feat: add Prometheus collector for DERP server expvar metrics (#22583)

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This PR does three things:
- Exports derp expvars to the pprof endpoint
- Exports the expvar metrics as prometheus metrics in both coderd and
wsproxy
- Updates our tailscale to a fix I also had to make to avoid a data race
condition

I generated this with mux but I also manually tested that the metrics
were getting properly emitted
This commit is contained in:
Jon Ayers
2026-03-06 01:57:58 -06:00
committed by GitHub
parent d034903736
commit 6c44de951d
11 changed files with 617 additions and 16 deletions
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go.mod
+10 -5
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@@ -36,7 +36,7 @@ replace github.com/tcnksm/go-httpstat => github.com/coder/go-httpstat v0.0.0-202
// There are a few minor changes we make to Tailscale that we're slowly upstreaming. Compare here:
// https://github.com/tailscale/tailscale/compare/main...coder:tailscale:main
replace tailscale.com => github.com/coder/tailscale v1.1.1-0.20250829055706-6eafe0f9199e
replace tailscale.com => github.com/coder/tailscale v1.1.1-0.20260306035934-af5c6fc52433
// This is replaced to include
// 1. a fix for a data race: c.f. https://github.com/tailscale/wireguard-go/pull/25
@@ -115,7 +115,7 @@ require (
github.com/coder/wgtunnel v0.2.0
github.com/coreos/go-oidc/v3 v3.17.0
github.com/coreos/go-systemd v0.0.0-20191104093116-d3cd4ed1dbcf
github.com/creack/pty v1.1.21
github.com/creack/pty v1.1.24
github.com/dave/dst v0.27.2
github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc
github.com/dblohm7/wingoes v0.0.0-20240820181039-f2b84150679e
@@ -289,9 +289,8 @@ require (
github.com/containerd/continuity v0.4.5 // indirect
github.com/coreos/go-iptables v0.6.0 // indirect
github.com/dlclark/regexp2 v1.11.5 // indirect
github.com/docker/cli v28.3.2+incompatible // indirect
github.com/docker/docker v28.3.3+incompatible // indirect
github.com/docker/go-connections v0.5.0 // indirect
github.com/docker/cli v29.2.0+incompatible // indirect
github.com/docker/go-connections v0.6.0 // indirect
github.com/docker/go-units v0.5.0 // indirect
github.com/dop251/goja v0.0.0-20241024094426-79f3a7efcdbd // indirect
github.com/dustin/go-humanize v1.0.1
@@ -537,8 +536,11 @@ require (
github.com/clipperhouse/uax29/v2 v2.5.0 // indirect
github.com/cncf/xds/go v0.0.0-20260202195803-dba9d589def2 // indirect
github.com/coder/paralleltestctx v0.0.1 // indirect
github.com/containerd/errdefs v1.0.0 // indirect
github.com/containerd/errdefs/pkg v0.3.0 // indirect
github.com/cpuguy83/go-md2man/v2 v2.0.7 // indirect
github.com/daixiang0/gci v0.13.7 // indirect
github.com/distribution/reference v0.6.0 // indirect
github.com/envoyproxy/go-control-plane/envoy v1.37.0 // indirect
github.com/envoyproxy/protoc-gen-validate v1.3.3 // indirect
github.com/esiqveland/notify v0.13.3 // indirect
@@ -562,6 +564,8 @@ require (
github.com/klauspost/cpuid/v2 v2.2.10 // indirect
github.com/landlock-lsm/go-landlock v0.0.0-20251103212306-430f8e5cd97c // indirect
github.com/mattn/go-shellwords v1.0.12 // indirect
github.com/moby/moby/api v1.54.0 // indirect
github.com/moby/moby/client v0.3.0 // indirect
github.com/moby/sys/user v0.4.0 // indirect
github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646 // indirect
github.com/openai/openai-go v1.12.0 // indirect
@@ -592,6 +596,7 @@ require (
go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.65.0 // indirect
go.opentelemetry.io/otel/sdk/metric v1.40.0 // indirect
go.yaml.in/yaml/v2 v2.4.3 // indirect
go.yaml.in/yaml/v3 v3.0.4 // indirect
go.yaml.in/yaml/v4 v4.0.0-rc.3 // indirect
golang.org/x/telemetry v0.0.0-20260209163413-e7419c687ee4 // indirect
google.golang.org/genai v1.47.0 // indirect