FIX(otel): increase metrics collector memory to 1Gi

- OTel metrics collector pods were OOMKilled with 512Mi limit
- Increased memory requests to 512Mi and limits to 1Gi

opentelemetry-collector/manifests/collector-metrics.yaml

@@ -33,9 +33,9 @@ spec:
   resources:
     requests:
       cpu: 50m
-      memory: 256Mi
-    limits:
       memory: 512Mi
+    limits:
+      memory: 1Gi
 
   ports:
     - name: otlp-grpc