FEAT(otel): add OTel Collector for logs and traces

- Add OpenTelemetry Operator for CR management
- Deploy OTel Collector as DaemonSet via CR
- Enable filelog receiver for container log collection
- Replace Promtail with OTel filelog receiver
- Keep Prometheus for ServiceMonitor-based metrics scraping

opentelemetry-operator/argocd.yaml

@@ -0,0 +1,44 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: opentelemetry-operator
+  namespace: argocd
+  finalizers:
+  - resources-finalizer.argocd.argoproj.io
+  annotations:
+    argocd.argoproj.io/sync-wave: "0"
+spec:
+  project: default
+  sources:
+  - repoURL: https://open-telemetry.github.io/opentelemetry-helm-charts
+    chart: opentelemetry-operator
+    targetRevision: 0.74.0
+    helm:
+      valueFiles:
+      - $values/opentelemetry-operator/helm-values.yaml
+  - repoURL: https://github.com/K3S-HOME/observability.git
+    targetRevision: main
+    ref: values
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: opentelemetry-operator
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
+      allowEmpty: false
+    syncOptions:
+    - CreateNamespace=true
+    - PrunePropagationPolicy=foreground
+    - PruneLast=true
+    - ServerSideApply=true
+    retry:
+      limit: 5
+      backoff:
+        duration: 5s
+        factor: 2
+        maxDuration: 3m
+    managedNamespaceMetadata:
+      labels:
+        goldilocks.fairwinds.com/enabled: 'true'
+  revisionHistoryLimit: 10

opentelemetry-operator/helm-values.yaml

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+# OpenTelemetry Operator Helm Values
+# Chart: https://github.com/open-telemetry/opentelemetry-helm-charts/tree/main/charts/opentelemetry-operator
+
+# Manager (Operator) configuration
+manager:
+  collectorImage:
+    repository: otel/opentelemetry-collector-contrib
+  targetAllocatorImage:
+    repository: ghcr.io/open-telemetry/opentelemetry-operator/target-allocator
+  autoInstrumentationImage:
+    java:
+      repository: ghcr.io/open-telemetry/opentelemetry-operator/autoinstrumentation-java
+    nodejs:
+      repository: ghcr.io/open-telemetry/opentelemetry-operator/autoinstrumentation-nodejs
+    python:
+      repository: ghcr.io/open-telemetry/opentelemetry-operator/autoinstrumentation-python
+    dotnet:
+      repository: ghcr.io/open-telemetry/opentelemetry-operator/autoinstrumentation-dotnet
+    go:
+      repository: ghcr.io/open-telemetry/opentelemetry-operator/autoinstrumentation-go
+  resources:
+    limits:
+      memory: 256Mi
+    requests:
+      cpu: 10m
+      memory: 64Mi
+
+# Admission webhooks (uses cert-manager self-signed CA)
+admissionWebhooks:
+  certManager:
+    enabled: true
+
+# Kube RBAC Proxy
+kubeRBACProxy:
+  enabled: true
+  resources:
+    limits:
+      memory: 64Mi
+    requests:
+      cpu: 5m
+      memory: 32Mi

opentelemetry-operator/kustomization.yaml

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+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - argocd.yaml