feat: add service discovery, OTel instrumentation, and k6 load tests

overlays/otel/patches/otel-patch.yaml

@@ -0,0 +1,19 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: petclinic
+spec:
+  template:
+    metadata:
+      annotations:
+        instrumentation.opentelemetry.io/inject-java: monitoring/otel-instrumentation
+    spec:
+      containers:
+      - name: workload
+        env:
+        - name: OTEL_SERVICE_NAME
+          value: petclinic
+        - name: OTEL_EXPORTER_OTLP_ENDPOINT
+          value: http://otel-collector.monitoring.svc.cluster.local:4318
+        - name: OTEL_RESOURCE_ATTRIBUTES
+          value: app=pclinic-andrej-demo1