observability

Observability hooks

This sample uses the SDK's standard-library observability surfaces: tags, immutable context fields, slog logging, and retry/history metric hooks. It does not add a telemetry framework or an OpenTelemetry collector; DTS-owned durable spans are covered elsewhere.

Run

export DTS_CONNECTION_STRING='Endpoint=http://127.0.0.1:8080;TaskHub=default;Authentication=None'
go run ./samples/observability

What it proves

• Root tags are visible in metadata and history.
• Immutable root context fields are persisted and visible in orchestration context/history. Activity contexts receive fields carried by the activity work item plus worker-local fields; current DTS emulator activity work items expose the worker-local field used here.
• ctx.Logger() suppresses replayed orchestrator output while activity logging keeps task identity fields.
• Retry and history metric hooks receive bounded, thread-safe signals without depending on exact batch-turn counts.

SAMPLE_OK observability is printed only after field values, log records, metrics, orchestration output, and exact-ID cleanup are verified.