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tsweb: expose native Prometheus metrics in /debug/varz

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The handler will expose built-in process and Go metrics by default,
which currently duplicate some of the expvar-proxied metrics
(`goroutines` vs `go_goroutines`, `memstats` vs `go_memstats`), but as
long as their names are different, Prometheus server will just scrape
both.

This will change /debug/varz behaviour for most tsweb binaries, but
notably not for control, which configures a `tsweb.VarzHandler`
[explicitly](a5b5d5167f/cmd/tailcontrol/tailcontrol.go (L779))

Updates https://github.com/tailscale/corp/issues/10205

Signed-off-by: Anton Tolchanov <anton@tailscale.com>
This commit is contained in:
Anton Tolchanov
2023-04-03 11:23:37 +01:00
committed by Anton Tolchanov
parent 690446c784
commit 11e6247d2a
6 changed files with 155 additions and 39 deletions
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20
go.mod
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@@ -52,6 +52,8 @@ require (
github.com/peterbourgon/ff/v3 v3.1.2
github.com/pkg/errors v0.9.1
github.com/pkg/sftp v1.13.4
github.com/prometheus/client_golang v1.14.0
github.com/prometheus/common v0.41.0
github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e
github.com/tailscale/certstore v0.1.1-0.20220316223106-78d6e1c49d8d
github.com/tailscale/depaware v0.0.0-20210622194025-720c4b409502
@@ -74,7 +76,7 @@ require (
golang.org/x/exp v0.0.0-20221205204356-47842c84f3db
golang.org/x/mod v0.7.0
golang.org/x/net v0.7.0
golang.org/x/oauth2 v0.4.0
golang.org/x/oauth2 v0.5.0
golang.org/x/sync v0.1.0
golang.org/x/sys v0.5.1-0.20230222185716-a3b23cc77e89
golang.org/x/term v0.5.0
@@ -135,7 +137,7 @@ require (
github.com/breml/bidichk v0.2.1 // indirect
github.com/butuzov/ireturn v0.1.1 // indirect
github.com/cavaliercoder/go-cpio v0.0.0-20180626203310-925f9528c45e // indirect
github.com/cespare/xxhash/v2 v2.1.2 // indirect
github.com/cespare/xxhash/v2 v2.2.0 // indirect
github.com/charithe/durationcheck v0.0.9 // indirect
github.com/chavacava/garif v0.0.0-20210405164556-e8a0a408d6af // indirect
github.com/cloudflare/circl v1.1.0 // indirect
@@ -218,7 +220,7 @@ require (
github.com/kisielk/errcheck v1.6.0 // indirect
github.com/kisielk/gotool v1.0.0 // indirect
github.com/kr/fs v0.1.0 // indirect
github.com/kr/pretty v0.3.0 // indirect
github.com/kr/pretty v0.3.1 // indirect
github.com/kr/text v0.2.0 // indirect
github.com/kulti/thelper v0.4.0 // indirect
github.com/kunwardeep/paralleltest v1.0.3 // indirect
@@ -230,7 +232,7 @@ require (
github.com/maratori/testpackage v1.0.1 // indirect
github.com/matoous/godox v0.0.0-20210227103229-6504466cf951 // indirect
github.com/mattn/go-runewidth v0.0.13 // indirect
github.com/matttproud/golang_protobuf_extensions v1.0.2-0.20181231171920-c182affec369 // indirect
github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
github.com/mbilski/exhaustivestruct v1.2.0 // indirect
github.com/mdlayher/socket v0.4.0 // indirect
github.com/mgechev/dots v0.0.0-20210922191527-e955255bf517 // indirect
@@ -257,14 +259,12 @@ require (
github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e // indirect
github.com/pmezard/go-difflib v1.0.0 // indirect
github.com/polyfloyd/go-errorlint v0.0.0-20211125173453-6d6d39c5bb8b // indirect
github.com/prometheus/client_golang v1.12.2 // indirect
github.com/prometheus/client_model v0.2.0 // indirect
github.com/prometheus/common v0.32.1 // indirect
github.com/prometheus/procfs v0.7.3 // indirect
github.com/prometheus/client_model v0.3.0 // indirect
github.com/prometheus/procfs v0.9.0 // indirect
github.com/quasilyte/go-ruleguard v0.3.13 // indirect
github.com/quasilyte/regex/syntax v0.0.0-20210819130434-b3f0c404a727 // indirect
github.com/rivo/uniseg v0.2.0 // indirect
github.com/rogpeppe/go-internal v1.8.1-0.20211023094830-115ce09fd6b4 // indirect
github.com/rogpeppe/go-internal v1.9.0 // indirect
github.com/ryancurrah/gomodguard v1.2.3 // indirect
github.com/ryanrolds/sqlclosecheck v0.3.0 // indirect
github.com/sanposhiho/wastedassign/v2 v2.0.7 // indirect
@@ -309,7 +309,7 @@ require (
golang.org/x/text v0.7.0 // indirect
gomodules.xyz/jsonpatch/v2 v2.2.0 // indirect
google.golang.org/appengine v1.6.7 // indirect
google.golang.org/protobuf v1.28.2-0.20230118093459-a9481185b34d // indirect
google.golang.org/protobuf v1.30.0 // indirect
gopkg.in/inf.v0 v0.9.1 // indirect
gopkg.in/ini.v1 v1.66.2 // indirect
gopkg.in/warnings.v0 v0.1.2 // indirect