[v15] Prevent races counting missed heartbeats #49910
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Increments the `heartbeatsMissedByAuth` gauge directly instead of keeping a local count and setting the gauge once. This fixes a race caught in https://github.com/gravitational/teleport/actions/runs/11828850190/job/32959672995?pr=48949. ``` ================== WARNING: DATA RACE Write at 0x00c003857da8 by goroutine 48258: github.com/gravitational/teleport/lib/auth.(*Server).runPeriodicOperations.func3.1() /__w/teleport/teleport/lib/auth/auth.go:1471 +0x84 github.com/gravitational/teleport/lib/services.(*UnifiedResourceCache).getRange.func1.1() /__w/teleport/teleport/lib/services/unified_resource.go:239 +0x14d github.com/google/btree.(*node[go.shape.*uint8]).iterate() /go/pkg/mod/github.com/google/[email protected]/btree_generic.go:522 +0x62c github.com/google/btree.(*BTreeG[go.shape.*uint8]).AscendRange() /go/pkg/mod/github.com/google/[email protected]/btree_generic.go:752 +0x104 github.com/google/btree.(*BTreeG[*github.com/gravitational/teleport/lib/services.item]).AscendRange-fm() <autogenerated>:1 +0x58 github.com/gravitational/teleport/lib/services.(*UnifiedResourceCache).getRange.func1() /__w/teleport/teleport/lib/services/unified_resource.go:230 +0x7a8 github.com/gravitational/teleport/lib/services.(*UnifiedResourceCache).read() /__w/teleport/teleport/lib/services/unified_resource.go:591 +0x2ad github.com/gravitational/teleport/lib/services.(*UnifiedResourceCache).getRange() /__w/teleport/teleport/lib/services/unified_resource.go:215 +0x2d9 github.com/gravitational/teleport/lib/services.(*UnifiedResourceCache).IterateUnifiedResources() /__w/teleport/teleport/lib/services/unified_resource.go:288 +0xe6 github.com/gravitational/teleport/lib/auth.(*Server).runPeriodicOperations.func3() /__w/teleport/teleport/lib/auth/auth.go:1464 +0x237 Previous read at 0x00c003857da8 by goroutine 48219: github.com/gravitational/teleport/lib/auth.(*Server).runPeriodicOperations.func3() /__w/teleport/teleport/lib/auth/auth.go:1489 +0x2d2 Goroutine 48258 (running) created at: github.com/gravitational/teleport/lib/auth.(*Server).runPeriodicOperations() /__w/teleport/teleport/lib/auth/auth.go:1460 +0xf9e github.com/gravitational/teleport/lib/auth.initCluster.gowrap1() /__w/teleport/teleport/lib/auth/init.go:594 +0x33 Goroutine 48219 (finished) created at: github.com/gravitational/teleport/lib/auth.(*Server).runPeriodicOperations() /__w/teleport/teleport/lib/auth/auth.go:1460 +0xf9e github.com/gravitational/teleport/lib/auth.initCluster.gowrap1() /__w/teleport/teleport/lib/auth/init.go:594 +0x33 ================== ```
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GavinFrazar
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zmb3
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Backport #49882 to branch/v15