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lukaszraczylo
35d26078f0
Concurrency/lifecycle (P1, highest-value): - singleton_resources.go: RegisterBackgroundTask now REPLACES a stopped task instead of reusing it. BackgroundTask.Start is sync.Once-guarded, so a task stopped on instance close and re-registered (Traefik close+recreate for the same provider) was permanently dead: IsTaskRunning returned false (started && !stopped) so callers retried a start that was a no-op. Metadata refresh, token cleanup, and health checks now resume across a recreate cycle. - error_recovery.go: the shared graceful-degradation health task was bound to the FIRST instance's performHealthChecks (later instances' checks never ran) and any instance's Close stopped it for all. Added a global live-instance registry; the shared task runs every instance's checks and is stopped only when the last instance closes (mirrors the singleton-token-cleanup gate). Storage/cache: - hybrid.go recordL2Error: Store(now) then immediately compared time.Since(t)<1s against its own write => ALWAYS fired, so a single transient L2 error flipped the whole cache into fallback (full L2 bypass -> upstream stampede). Now enters fallback only on a PRIOR error within the window (true "multiple errors"). Updated two tests that had encoded the old single-error-fallback bug. - redis_pool.go: ConnectionPool.Put checked closed but sent on p.connections without holding p.mu; Close closed it under p.mu. Window => 'send on closed channel' panic at shutdown. Put now holds p.mu (the lock only Close used). HTTP/transport: - jwk.go fetchJWKS: added an explicit >1 MiB guard (was silent partial read, could yield a truncated keyset and spurious missing-kid). - http_client_pool.go configKey: now includes every transport-behavior field it actually consumes (compression, HTTP2, keep-alives, timeouts, buffer sizes, dial) so behaviorally different configs no longer share one transport built with the first config's settings. Each fix has a regression test. Verified: full source-order suite green, golangci-lint 0 issues, 3x full -race -count=1 -shuffle=on ./... all exit 0.