otel-collector config to populate FAAS name (#42)

otel-collector/cmd/otel-collector/kodata/config.yaml

@@ -7,6 +7,8 @@ receivers:
         static_configs:
         # TODO: make this configurable
         - targets: ["localhost:2112"]
+        # Do not relabel job and instance labels if existed.
+        honor_labels: true
         metric_relabel_configs:
           - source_labels: [ __name__ ]
             regex: '^prometheus_.*'
@@ -39,17 +41,22 @@ processors:
 
   resource:
     attributes:
-      # add instance_id as a resource attribute
-    - key: service.instance.id
-      from_attribute: faas.id
+    # The `gcp` resourcedetection processor sets `faas.name` to the name of the
+    # Cloud Run service or the Cloud Run job.
+    - from_attribute: faas.name
+      # The googlemanagedprometheus exporter consumes `service.name` attribute
+      # and set the `job` resource label to this value. (See
+      # https://github.com/GoogleCloudPlatform/opentelemetry-operations-go/pull/764)
+      key: "service.name"
       action: upsert
-      # parse service name from K_SERVICE Cloud Run variable
-    - key: service.name
-      value: ${env:K_SERVICE}
-      action: insert
 
 exporters:
   googlemanagedprometheus:
+    sending_queue:
+      enabled: true
+      # we are handling metrics for a single pod, no need to have
+      # too many senders. this will also avoid out-of-order data.
+      num_consumers: 1
 
 extensions:
   health_check: