OpenTelemetry

Create one client span per logical send and event records for failed attempts.

src/lib/tracing.ts

import { otel } from "@postbote/plugin-otel";

const tracing = otel({
  tracer: tracerProvider.getTracer("mail"),
  captureRecipients: "count",
});

The plugin creates a postbote.send client span. It records the adapter, message ID on success, attempt count, recipient count unless disabled, and a normalized error code on failure. Failed adapter attempts become postbote.attempt span events.

Addresses, subject, and body content are never captured. When no tracer is supplied, the plugin uses trace.getTracer("@postbote/plugin-otel"); the OpenTelemetry API remains a no-op until an application registers a provider.

Place otel() before failover() to trace the entire logical send.