Add resource with pid to OTEL metrics

server/mergin/otel/instrument.py

@@ -20,17 +20,21 @@
 from .config import Configuration
 
 
-def setup_otel_provider():
-    """
-    Initializes the Tracer Engine. Call this Gunicorn in post_fork or in Celery worker_process_init.
-    """
-    resource = Resource.create(
+def create_resource():
+    return Resource.create(
         {
             "service.name": Configuration.OTEL_SERVICE_NAME,
-            "process.pid": os.getpid(),  # useful for debugging forks
+            "process.pid": os.getpid(),
         }
     )
 
+
+def setup_otel_provider():
+    """
+    Initializes the Tracer Engine. Call this Gunicorn in post_fork or in Celery worker_process_init.
+    """
+    resource = create_resource()
+
     sampler = ParentBased(root=TraceIdRatioBased(Configuration.OTEL_TRACES_SAMPLER_ARG))
     provider = TracerProvider(resource=resource, sampler=sampler)
 
@@ -46,12 +50,13 @@ def setup_otel_provider():
 
 def setup_otel_metrics():
     """Initializes the Metrics Engine. Call this in post_fork."""
+    resource = create_resource()
     exporter = OTLPMetricExporter(
         endpoint=Configuration.OTEL_EXPORTER_OTLP_ENDPOINT, insecure=True
     )
     reader = PeriodicExportingMetricReader(exporter)
 
-    provider = MeterProvider(metric_readers=[reader])
+    provider = MeterProvider(resource=resource, metric_readers=[reader])
     metrics.set_meter_provider(provider)