---
# Loki — log aggregation (docs/10). Serves R-OBS-01. PVC size is an overlay knob (R-ENV-02).
#
# DEV-SCOPED for the ~22 GiB ceiling. Deployment mode is SingleBinary (one pod, filesystem
# storage) — the scalable read/write/backend split is prod-only. CRITICAL RAM TRIM: the grafana
# loki chart's default memcached caches (chunksCache/resultsCache) request ~8-9 GiB EACH; both are
# disabled here. The nginx `gateway`, self-monitoring, and the canary/test hooks are disabled too.
#
# Retention is enforced by the COMPACTOR (retention_enabled: true) — a retention_period alone does
# nothing (docs/10, and a known-gotcha carried from the legacy stack).
apiVersion: helm.toolkit.fluxcd.io/v2
kind: HelmRelease
metadata:
  name: loki
  namespace: monitoring
spec:
  interval: 30m
  chart:
    spec:
      chart: loki
      version: ">=7.0.0 <8.0.0"   # chart 7.x (Loki 3.6.x); Renovate maintains. Verified: chart 7 renders identically
                                   # for this SingleBinary/filesystem config (one `loki` StatefulSet, no extra pods).
      sourceRef:
        kind: HelmRepository
        name: grafana
        namespace: monitoring
  install:
    remediation:
      retries: 3
  upgrade:
    remediation:
      retries: 3
  values:
    deploymentMode: SingleBinary

    loki:
      auth_enabled: false
      commonConfig:
        replication_factor: 1          # single binary — no ring replication
      storage:
        type: filesystem
      schemaConfig:
        configs:
          - from: "2024-04-01"
            store: tsdb
            object_store: filesystem
            schema: v13
            index:
              prefix: loki_index_
              period: 24h
      limits_config:
        # NOTE: Loki's LOG retention has no dedicated cluster-vars knob (only the 3 monitoring vars
        # exist). Held to a dev-friendly 72h to mirror the dev metrics retention; promote to an
        # overlay knob if per-env log retention is ever needed. See README / report.
        retention_period: 72h
      compactor:
        retention_enabled: true         # REQUIRED — a period alone does not delete (docs/10)
        delete_request_store: filesystem

    singleBinary:
      replicas: 1
      persistence:
        enabled: true
        storageClass: longhorn          # replicated tier (ADR-0003)
        size: ${MONITORING_LOKI_PVC_SIZE}   # overlay knob (dev 5Gi / prod large)
      resources:
        requests:
          cpu: 100m
          memory: 192Mi
        limits:
          memory: 512Mi

    # Not used in SingleBinary mode — pinned to 0 so a chart default can't spin up extra pods.
    backend:
      replicas: 0
    read:
      replicas: 0
    write:
      replicas: 0

    # --- RAM trims: kill the memory-hungry / non-essential-for-dev pieces ---
    chunksCache:
      enabled: false                    # default memcached requests ~8-9Gi — must stay off in dev
    resultsCache:
      enabled: false
    gateway:
      enabled: false                    # no nginx front door needed for a single binary in-cluster
    lokiCanary:
      enabled: false
    test:
      enabled: false
    # Alloy ships logs here (in-cluster service DNS, no gateway):
    #   http://loki.monitoring.svc.cluster.local:3100/loki/api/v1/push