# OpenTelemetry Collector Helm Values
# Chart: https://github.com/open-telemetry/opentelemetry-helm-charts
#
# Architecture:
# - DaemonSet mode: one collector per node for efficient data collection
# - OTLP receiver for traces, metrics, and logs
# - Filelog receiver for container logs (replaces Promtail)
# - Prometheus receiver for metrics scraping (replaces Prometheus scrape)
# - Exports to: Tempo (traces), Prometheus (metrics), Loki (logs)
#
# Pipeline:
#   Applications → OTel Collector → Tempo/Prometheus/Loki → Grafana

# =============================================================================
# Image Configuration
# =============================================================================
image:
  repository: otel/opentelemetry-collector-contrib

# =============================================================================
# Deployment Mode
# =============================================================================
mode: daemonset

# =============================================================================
# Resource Limits (increased for log + metrics collection)
# =============================================================================
resources:
  requests:
    cpu: 50m
    memory: 512Mi
  limits:
    memory: 512Mi

# =============================================================================
# Environment Variables
# =============================================================================
extraEnvs:
  - name: K8S_NODE_NAME
    valueFrom:
      fieldRef:
        fieldPath: spec.nodeName
  - name: K8S_POD_NAME
    valueFrom:
      fieldRef:
        fieldPath: metadata.name
  - name: K8S_POD_IP
    valueFrom:
      fieldRef:
        fieldPath: status.podIP

# =============================================================================
# Extra Volumes for Log Collection
# =============================================================================
extraVolumes:
  - name: varlogpods
    hostPath:
      path: /var/log/pods
  - name: varlibdockercontainers
    hostPath:
      path: /var/lib/docker/containers

extraVolumeMounts:
  - name: varlogpods
    mountPath: /var/log/pods
    readOnly: true
  - name: varlibdockercontainers
    mountPath: /var/lib/docker/containers
    readOnly: true

# =============================================================================
# Ports
# =============================================================================
ports:
  otlp:
    enabled: true
    containerPort: 4317
    servicePort: 4317
    hostPort: 4317
    protocol: TCP
  otlp-http:
    enabled: true
    containerPort: 4318
    servicePort: 4318
    hostPort: 4318
    protocol: TCP
  metrics:
    enabled: true
    containerPort: 8888
    servicePort: 8888
    protocol: TCP

# =============================================================================
# OpenTelemetry Collector Configuration
# =============================================================================
config:
  # ---------------------------------------------------------------------------
  # Receivers - what data the collector accepts
  # ---------------------------------------------------------------------------
  receivers:
    # OTLP receiver for application telemetry
    otlp:
      protocols:
        grpc:
          endpoint: 0.0.0.0:4317
        http:
          endpoint: 0.0.0.0:4318

    # Filelog receiver for container logs (replaces Promtail)
    filelog:
      include:
        - /var/log/pods/*/*/*.log
      exclude:
        # Exclude collector's own logs to prevent feedback loop
        - /var/log/pods/opentelemetry_opentelemetry-collector*/*/*.log
      start_at: end
      include_file_path: true
      include_file_name: false
      operators:
        # Route based on log format
        - type: router
          id: get-format
          routes:
            - output: parser-docker
              expr: 'body matches "^\\{"'
            - output: parser-containerd
              expr: 'body matches "^[^ Z]+Z"'
          default: parser-containerd

        # Docker JSON format parser
        - type: json_parser
          id: parser-docker
          output: extract-metadata-from-filepath
          timestamp:
            parse_from: attributes.time
            layout: '%Y-%m-%dT%H:%M:%S.%LZ'

        # Containerd/CRI format parser
        - type: regex_parser
          id: parser-containerd
          regex: '^(?P<time>[^ ^Z]+Z) (?P<stream>stdout|stderr) (?P<logtag>[^ ]*) ?(?P<log>.*)$'
          output: extract-metadata-from-filepath
          timestamp:
            parse_from: attributes.time
            layout: '%Y-%m-%dT%H:%M:%S.%LZ'

        # Extract metadata from file path
        - type: regex_parser
          id: extract-metadata-from-filepath
          regex: '^.*\/(?P<namespace>[^_]+)_(?P<pod_name>[^_]+)_(?P<uid>[a-f0-9-]+)\/(?P<container_name>[^\/]+)\/.*$'
          parse_from: attributes["log.file.path"]

        # Move attributes to resource
        - type: move
          from: attributes.namespace
          to: resource["k8s.namespace.name"]
        - type: move
          from: attributes.pod_name
          to: resource["k8s.pod.name"]
        - type: move
          from: attributes.container_name
          to: resource["k8s.container.name"]
        - type: move
          from: attributes.uid
          to: resource["k8s.pod.uid"]
        - type: move
          from: attributes.stream
          to: attributes["log.iostream"]
        - type: move
          from: attributes.log
          to: body
        # Loki label hints - tell Loki exporter which attributes to use as labels
        - type: add
          field: resource["loki.resource.labels"]
          value: "k8s.namespace.name, k8s.pod.name, k8s.container.name, k8s.node.name"
        - type: add
          field: attributes["loki.attribute.labels"]
          value: "log.iostream"

    # Prometheus receiver - self metrics only
    # Infrastructure metrics (node-exporter, kube-state-metrics) handled by Prometheus
    prometheus:
      config:
        scrape_configs:
          # OTel Collector self metrics only
          - job_name: 'otel-collector'
            scrape_interval: 60s
            static_configs:
              - targets: ['${env:K8S_POD_IP}:8888']

  # ---------------------------------------------------------------------------
  # Processors - how data is transformed
  # ---------------------------------------------------------------------------
  processors:
    # Batch processor for efficient exports
    batch:
      timeout: 10s
      send_batch_size: 1024
      send_batch_max_size: 2048

    # Memory limiter to prevent OOM
    memory_limiter:
      check_interval: 5s
      limit_mib: 400
      spike_limit_mib: 100

    # Add Kubernetes metadata
    k8sattributes:
      extract:
        metadata:
          - k8s.namespace.name
          - k8s.deployment.name
          - k8s.pod.name
          - k8s.node.name
      passthrough: false
      pod_association:
        - sources:
            - from: resource_attribute
              name: k8s.pod.ip
        - sources:
            - from: resource_attribute
              name: k8s.pod.uid
        - sources:
            - from: connection

    # Resource detection
    resourcedetection:
      detectors: [env, system]
      timeout: 5s
      override: false

  # ---------------------------------------------------------------------------
  # Exporters - where data goes
  # ---------------------------------------------------------------------------
  exporters:
    # Tempo for traces
    otlp/tempo:
      endpoint: tempo.tempo.svc.cluster.local:4317
      tls:
        insecure: true

    # Prometheus remote write for metrics
    prometheusremotewrite:
      endpoint: http://prometheus-kube-prometheus-prometheus.prometheus.svc:9090/api/v1/write
      tls:
        insecure: true
      external_labels:
        otel_collector: ${env:K8S_POD_NAME}

    # Loki for logs
    loki:
      endpoint: http://loki.loki.svc.cluster.local:3100/loki/api/v1/push
      default_labels_enabled:
        exporter: false
        level: true

    # Debug exporter (for troubleshooting)
    debug:
      verbosity: basic

  # ---------------------------------------------------------------------------
  # Extensions
  # ---------------------------------------------------------------------------
  extensions:
    health_check:
      endpoint: 0.0.0.0:13133

  # ---------------------------------------------------------------------------
  # Service pipelines
  # ---------------------------------------------------------------------------
  service:
    extensions: [health_check]
    pipelines:
      # Traces pipeline
      traces:
        receivers: [otlp]
        processors: [memory_limiter, k8sattributes, resourcedetection, batch]
        exporters: [otlp/tempo]

      # Metrics pipeline (OTLP + Prometheus scraping)
      metrics:
        receivers: [otlp, prometheus]
        processors: [memory_limiter, k8sattributes, resourcedetection, batch]
        exporters: [prometheusremotewrite]

      # Logs pipeline (OTLP + Filelog)
      logs:
        receivers: [otlp, filelog]
        processors: [memory_limiter, k8sattributes, resourcedetection, batch]
        exporters: [loki]

# =============================================================================
# Service Account
# =============================================================================
serviceAccount:
  create: true

# =============================================================================
# RBAC for k8sattributes processor and prometheus receiver
# =============================================================================
clusterRole:
  create: true
  rules:
    - apiGroups: [""]
      resources: ["pods", "namespaces", "nodes", "endpoints", "services"]
      verbs: ["get", "watch", "list"]
    - apiGroups: ["apps"]
      resources: ["replicasets", "deployments"]
      verbs: ["get", "watch", "list"]
    - apiGroups: ["discovery.k8s.io"]
      resources: ["endpointslices"]
      verbs: ["get", "watch", "list"]

# =============================================================================
# ServiceMonitor for Prometheus (keep for backward compatibility)
# =============================================================================
serviceMonitor:
  enabled: true
  metricsEndpoints:
    - port: metrics
  extraLabels:
    release: prometheus

# =============================================================================
# Pod Monitor for self-monitoring
# =============================================================================
podMonitor:
  enabled: false