Update load tests

Author: dhurley

test/config/agent/nginx-agent-otel-load.conf

@@ -20,21 +20,30 @@ allowed_directories:
 collector:
   receivers:
     otlp:
-      - server:
+      "default":
+        server:
           host: "127.0.0.1"
           port: 4317
   processors:
     batch:
-      send_batch_size: 8192
-      timeout: 200ms
-      send_batch_max_size: 0
+      "default":
+        send_batch_size: 8192
+        timeout: 200ms
+        send_batch_max_size: 0
   exporters:
     otlp:
-      - server:
-          host: "127.0.0.1"
-          port: 5643
+      "default":
+         server:
+           host: "127.0.0.1"
+           port: 5643
   extensions:
     health:
       server:
         host: "127.0.0.1"
         port: 1337
+  pipelines:
+    metrics:
+      "default":
+        receivers: ["otlp/default"]
+        processors: ["batch/default"]
+        exporters: ["otlp/default"]