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

overlays/otel/kustomization.yaml

@@ -0,0 +1,14 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+- ../deploy
+patches:
+- target:
+    kind: Deployment
+    name: petclinic
+  patch: "apiVersion: apps/v1\nkind: Deployment\nmetadata:\n  name: petclinic\nspec:\n\
+    \  template:\n    metadata:\n      annotations:\n        instrumentation.opentelemetry.io/inject-java:\
+    \ monitoring/otel-instrumentation\n    spec:\n      containers:\n      - name:\
+    \ workload\n        env:\n        - name: OTEL_SERVICE_NAME\n          value:\
+    \ petclinic\n        - name: OTEL_EXPORTER_OTLP_ENDPOINT\n          value: http://otel-collector.monitoring.svc.cluster.local:4318\n\
+    \        - name: OTEL_RESOURCE_ATTRIBUTES\n          value: app=petclinic-demo-andrej-doc\n"