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health: make it omittable

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And stop depending on expvar and usermetrics when disabled,
in prep to removing all the expvar/metrics/tsweb stuff.

Updates #12614

Change-Id: I35d2479ddd1d39b615bab32b1fa940ae8cbf9b11
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2025-10-03 11:05:37 -07:00
committed by Brad Fitzpatrick
parent 9c3aec58ba
commit 447cbdd1d0
17 changed files with 369 additions and 230 deletions
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3
health/state.go
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@@ -9,6 +9,7 @@ import (
"encoding/json"
"time"
"tailscale.com/feature/buildfeatures"
"tailscale.com/tailcfg"
)
@@ -120,7 +121,7 @@ func (w *Warnable) unhealthyState(ws *warningState) *UnhealthyState {
// The returned State is a snapshot of shared memory, and the caller should not
// mutate the returned value.
func (t *Tracker) CurrentState() *State {
if t.nil() {
if !buildfeatures.HasHealth || t.nil() {
return &State{}
}