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## Why SQLite log persistence needs visibility into batch size, write latency, failures, and entries dropped before they reach the writer. Exporter diagnostics must not feed back into the SQLite log sink and keep metric exports active indefinitely. ## What changed - Record write count, duration, batch bytes, entry count, largest-entry size, and queue drops with bounded outcome tags. - Add explicit byte histogram boundaries for log batch metrics. - Filter OTLP transport noise and the benign unsolicited HTTP/2 PING warning from SQLite log persistence to prevent export cycles while retaining other HTTP/2 warnings. ## Testing - Cover metric values, tags, queue-drop reasons, and histogram boundaries. - Verify successful and failed OTLP HTTP and gRPC exports become idle instead of generating recurring SQLite log-write metrics. GitOrigin-RevId: a63224ae15945fe84adc977a8b7d55bb47a4de53