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wgengine/magicsock: add home DERP region usermetric (#18062)

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Expose the node's home DERP region ID as a Prometheus gauge via the
usermetrics endpoint.

Fixes #18061

Signed-off-by: Raj Singh <raj@tailscale.com>
This commit is contained in:
Raj Singh
2026-01-09 16:47:56 -05:00
committed by GitHub
parent 5db95ec376
commit aadc4f2ef4
2 changed files with 19 additions and 0 deletions
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wgengine/magicsock/derp.go
+12
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@@ -216,17 +216,28 @@ func (c *Conn) derpRegionCodeLocked(regionID int) string {
return ""
}
// setHomeDERPGaugeLocked updates the home DERP gauge metric.
//
// c.mu must be held.
func (c *Conn) setHomeDERPGaugeLocked(derpNum int) {
if c.homeDERPGauge != nil {
c.homeDERPGauge.Set(float64(derpNum))
}
}
// c.mu must NOT be held.
func (c *Conn) setNearestDERP(derpNum int) (wantDERP bool) {
c.mu.Lock()
defer c.mu.Unlock()
if !c.wantDerpLocked() {
c.myDerp = 0
c.setHomeDERPGaugeLocked(0)
c.health.SetMagicSockDERPHome(0, c.homeless)
return false
}
if c.homeless {
c.myDerp = 0
c.setHomeDERPGaugeLocked(0)
c.health.SetMagicSockDERPHome(0, c.homeless)
return false
}
@@ -238,6 +249,7 @@ func (c *Conn) setNearestDERP(derpNum int) (wantDERP bool) {
metricDERPHomeChange.Add(1)
}
c.myDerp = derpNum
c.setHomeDERPGaugeLocked(derpNum)
c.health.SetMagicSockDERPHome(derpNum, c.homeless)
if c.privateKey.IsZero() {