{"record":{"id":"64fbeb58b1176a8b","repo":"vxcontrol/pentagi","slug":"failed-to-force-flush-meter-w","errorCode":null,"errorMessage":"failed to force flush meter: %w","messagePattern":"failed to force flush meter: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"backend/pkg/observability/otelclient.go","lineNumber":90,"sourceCode":"\t}\n\tif err := c.tracer.Shutdown(ctx); err != nil {\n\t\terrs = append(errs, fmt.Errorf(\"failed to shutdown tracer: %w\", err))\n\t}\n\t// Always close the connection, even if a provider shutdown failed above, so a\n\t// stalled flush can't leak the grpc conn.\n\tif err := c.conn.Close(); err != nil {\n\t\terrs = append(errs, fmt.Errorf(\"failed to close telemetry connection: %w\", err))\n\t}\n\treturn errors.Join(errs...)\n}\n\nfunc (c *telemetryClient) ForceFlush(ctx context.Context) error {\n\tvar errs []error\n\tif err := c.logger.ForceFlush(ctx); err != nil {\n\t\terrs = append(errs, fmt.Errorf(\"failed to force flush logger: %w\", err))\n\t}\n\tif err := c.meter.ForceFlush(ctx); err != nil {\n\t\terrs = append(errs, fmt.Errorf(\"failed to force flush meter: %w\", err))\n\t}\n\tif err := c.tracer.ForceFlush(ctx); err != nil {\n\t\terrs = append(errs, fmt.Errorf(\"failed to force flush tracer: %w\", err))\n\t}\n\treturn errors.Join(errs...)\n}\n\nfunc NewTelemetryClient(ctx context.Context, cfg *config.Config) (TelemetryClient, error) {\n\tif cfg.TelemetryEndpoint == \"\" {\n\t\treturn nil, fmt.Errorf(\"telemetry endpoint is not set: %w\", ErrNotConfigured)\n\t}\n\n\t// grpc.NewClient is non-blocking: it never dials during startup, so a\n\t// set-but-unreachable collector can't stall main(), and the connection is\n\t// established (and re-established) lazily in the background — a collector that\n\t// comes up after the app does connects on its own, without a restart.\n\tconn, err := grpc.NewClient(\n\t\tcfg.TelemetryEndpoint,","sourceCodeStart":72,"sourceCodeEnd":108,"githubUrl":"https://github.com/vxcontrol/pentagi/blob/ea665308baaff015b226f308438a68d929d0f29b/backend/pkg/observability/otelclient.go#L72-L108","documentation":"This error is produced by telemetryClient.ForceFlush when the OpenTelemetry metric provider (sdk metric MeterProvider) fails to force-push all queued metric data. It is wrapped so the caller knows the meter leg of the flush failed; logger and tracer errors are reported separately and all are joined with errors.Join.","triggerScenarios":"Calling ForceFlush(ctx) when the metric reader/exporter cannot deliver pending metrics: ctx cancelled or deadline exceeded, otlpmetricgrpc Export failing because the collector is down, or transient gRPC errors (with WaitForReady the call waits and can hit the ctx deadline).","commonSituations":"Collector restarted or unreachable during shutdown; large metric batches taking longer than the context timeout; firewall/network issues to the OTLP endpoint (typically :4317).","solutions":["Inspect the wrapped error to distinguish deadline vs export failure","Confirm the collector endpoint from cfg.TelemetryEndpoint accepts OTLP gRPC metrics","Extend the context timeout used for the flush","Check collector logs/storage; if metrics were lost, verify collector enablement in docker-compose-observability.yml"],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":"if cfg.TelemetryEndpoint == \"\" { skip telemetry setup }","typeGuard":null,"tryCatchPattern":"if err := client.ForceFlush(ctx); err != nil {\n    if strings.Contains(err.Error(), \"force flush meter\") {\n        // metrics leg failed: verify collector metrics receiver\n    }\n    log.Warnf(\"metric flush failed: %v\", err)\n}","preventionTips":["Keep the flush context timeout generous (metrics batches can be large)","Monitor collector availability","Register shutdown hooks that flush before process exit","Validate endpoint reachability at startup"],"tags":["opentelemetry","flush","metrics","grpc"],"backgroundTag":"otlp-flush-failed","analyzedSha":"ea665308baaff015b226f308438a68d929d0f29b","analyzedAt":"2026-09-01T14:16:31.421Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-08T10:18:20.063Z"}