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Change pprof labels to be prometheus compatible (#32865)

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Enables scrapping pprof endpoint for continuous profiling

Closes: https://github.com/go-gitea/gitea/issues/32854
This commit is contained in:
TheFox0x7 2024-12-18 04:08:04 +01:00 committed by GitHub
parent 195fccd617
commit b945742293
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GPG Key ID: B5690EEEBB952194
4 changed files with 16 additions and 10 deletions
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6
modules/graceful/manager.go
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@ -136,7 +136,7 @@ func (g *Manager) doShutdown() {
}
g.lock.Lock()
g.shutdownCtxCancel()
atShutdownCtx := pprof.WithLabels(g.hammerCtx, pprof.Labels("graceful-lifecycle", "post-shutdown"))
atShutdownCtx := pprof.WithLabels(g.hammerCtx, pprof.Labels(LifecyclePProfLabel, "post-shutdown"))
pprof.SetGoroutineLabels(atShutdownCtx)
for _, fn := range g.toRunAtShutdown {
go fn()
@ -167,7 +167,7 @@ func (g *Manager) doHammerTime(d time.Duration) {
default:
log.Warn("Setting Hammer condition")
g.hammerCtxCancel()
atHammerCtx := pprof.WithLabels(g.terminateCtx, pprof.Labels("graceful-lifecycle", "post-hammer"))
atHammerCtx := pprof.WithLabels(g.terminateCtx, pprof.Labels(LifecyclePProfLabel, "post-hammer"))
pprof.SetGoroutineLabels(atHammerCtx)
}
g.lock.Unlock()
@ -183,7 +183,7 @@ func (g *Manager) doTerminate() {
default:
log.Warn("Terminating")
g.terminateCtxCancel()
atTerminateCtx := pprof.WithLabels(g.managerCtx, pprof.Labels("graceful-lifecycle", "post-terminate"))
atTerminateCtx := pprof.WithLabels(g.managerCtx, pprof.Labels(LifecyclePProfLabel, "post-terminate"))
pprof.SetGoroutineLabels(atTerminateCtx)
for _, fn := range g.toRunAtTerminate {

14
modules/graceful/manager_common.go
View File

@ -22,6 +22,12 @@ const (
watchdogMsg systemdNotifyMsg = "WATCHDOG=1"
)
// LifecyclePProfLabel is a label marking manager lifecycle phase
// Making it compliant with prometheus key regex https://prometheus.io/docs/concepts/data_model/#metric-names-and-labels
// would enable someone interested to be able to to continuously gather profiles into pyroscope.
// Other labels for pprof (in "modules/process" package) should also follow this rule.
const LifecyclePProfLabel = "graceful_lifecycle"
func statusMsg(msg string) systemdNotifyMsg {
return systemdNotifyMsg("STATUS=" + msg)
}
@ -65,10 +71,10 @@ func (g *Manager) prepare(ctx context.Context) {
g.hammerCtx, g.hammerCtxCancel = context.WithCancel(ctx)
g.managerCtx, g.managerCtxCancel = context.WithCancel(ctx)
g.terminateCtx = pprof.WithLabels(g.terminateCtx, pprof.Labels("graceful-lifecycle", "with-terminate"))
g.shutdownCtx = pprof.WithLabels(g.shutdownCtx, pprof.Labels("graceful-lifecycle", "with-shutdown"))
g.hammerCtx = pprof.WithLabels(g.hammerCtx, pprof.Labels("graceful-lifecycle", "with-hammer"))
g.managerCtx = pprof.WithLabels(g.managerCtx, pprof.Labels("graceful-lifecycle", "with-manager"))
g.terminateCtx = pprof.WithLabels(g.terminateCtx, pprof.Labels(LifecyclePProfLabel, "with-terminate"))
g.shutdownCtx = pprof.WithLabels(g.shutdownCtx, pprof.Labels(LifecyclePProfLabel, "with-shutdown"))
g.hammerCtx = pprof.WithLabels(g.hammerCtx, pprof.Labels(LifecyclePProfLabel, "with-hammer"))
g.managerCtx = pprof.WithLabels(g.managerCtx, pprof.Labels(LifecyclePProfLabel, "with-manager"))
if !g.setStateTransition(stateInit, stateRunning) {
panic("invalid graceful manager state: transition from init to running failed")

2
modules/process/context.go
View File

@ -32,7 +32,7 @@ func (c *Context) Value(key any) any {
}
// ProcessContextKey is the key under which process contexts are stored
var ProcessContextKey any = "process-context"
var ProcessContextKey any = "process_context"
// GetContext will return a process context if one exists
func GetContext(ctx context.Context) *Context {

4
modules/process/manager.go
View File

@ -26,7 +26,7 @@ var (
)
// DescriptionPProfLabel is a label set on goroutines that have a process attached
const DescriptionPProfLabel = "process-description"
const DescriptionPProfLabel = "process_description"
// PIDPProfLabel is a label set on goroutines that have a process attached
const PIDPProfLabel = "pid"
@ -35,7 +35,7 @@ const PIDPProfLabel = "pid"
const PPIDPProfLabel = "ppid"
// ProcessTypePProfLabel is a label set on goroutines that have a process attached
const ProcessTypePProfLabel = "process-type"
const ProcessTypePProfLabel = "process_type"
// IDType is a pid type
type IDType string