chore: Correlate logs with traces in Datadog

package.json

@@ -25,6 +25,7 @@
   "dependencies": {
     "@opentelemetry/api": "^1.7.0",
     "@opentelemetry/auto-instrumentations-node": "^0.41.1",
+    "@opentelemetry/instrumentation-pino": "^0.35.0",
     "@operate-first/probot-metrics": "^1.0.0",
     "@probot/adapter-aws-lambda-serverless": "^3.0.2",
     "deepmerge": "^4.3.1",

tracing.js

@@ -1,6 +1,7 @@
 // Configuring manually due to https://github.com/open-telemetry/opentelemetry-js-contrib/issues/1773
 const process = require('process')
 const { HttpInstrumentation } = require('@opentelemetry/instrumentation-http')
+const { PinoInstrumentation } = require('@opentelemetry/instrumentation-pino')
 const opentelemetry = require('@opentelemetry/sdk-node')
 const { OTLPTraceExporter } = require('@opentelemetry/exporter-trace-otlp-grpc')
 const { Resource } = require('@opentelemetry/resources')
@@ -18,6 +19,25 @@ if (OTEL_EXPORTER_OTLP_ENDPOINT) {
     textMapPropagator: new W3CTraceContextPropagator(),
     traceExporter,
     instrumentations: [
+      new PinoInstrumentation({
+        logHook: (span, record) => {
+          const spanContext = span?.spanContext()
+
+          if (!spanContext) {
+            return
+          }
+
+          // Transform IDs from opentelemetry format to Datadog format
+          // https://docs.datadoghq.com/tracing/other_telemetry/connect_logs_and_traces/opentelemetry/?tab=nodejs)
+          const { spanId, traceId } = spanContext
+          const traceIdEnd = traceId.slice(traceId.length / 2)
+          const datadogTraceId = BigInt(`0x${traceIdEnd}`).toString()
+          const datadogSpanId = BigInt(`0x${spanId}`).toString()
+
+          record['dd.trace_id'] = datadogTraceId
+          record['dd.span_id'] = datadogSpanId
+        }
+      }),
       new HttpInstrumentation({
         ignoreIncomingPaths: ['/health', '/metrics', '/ping']
       })