controller:
  nameOverride: "alloy-node-scrapper"
  volumes:
    extra:
      # requires host journal configuration storage = volatile
      - name: run-log-journal
        hostPath:
          path: /run/log/journal
      # Log scrapers (e.g., Alloy/Loki) read this ID from the journal metadata and use it to separate log streams per machine.
      - name: etc-machine-id
        hostPath:
          path: /etc/machine-id
  
  tolerations:
    - key: "node-role.kubernetes.io/control-plane"
      operator: "Exists"
      effect: "NoSchedule"
    - key: "infra.limbosolutions.com/dedicated"
      operator: "Exists"
      effect: "NoSchedule"

alloy:
  mounts:
    varlog: true  # Mounts /var/log from the host (persistent journal)
    extra:
      # requires host journal configuration storage = volatile
      - name: run-log-journal
        mountPath: /run/log/journal
        readOnly: true
      # required 
      - name: etc-machine-id
        mountPath: /etc/machine-id
        readOnly: true

  # https://grafana.com/docs/alloy/latest/collect/logs-in-kubernetes/
  configMap:
    content: |
      // ============================================
      // LOKI WRITE TARGET
      // ============================================
      loki.write "loki_srv" {
        endpoint {
          url = env("LOKI_URL")
        }
      }

      // ============================================
      // HOST JOURNALD SOURCE
      // ============================================

      // Read journald logs from the host
      loki.source.journal "journal" {
        max_age   = "24h"
        relabel_rules = discovery.relabel.host_journal.rules
        forward_to    = [loki.process.host_journal.receiver]
      }

      // ============================================
      // HOST JOURNALD RELABELING
      // ============================================

      // Convert journald metadata into Loki labels
      discovery.relabel "host_journal" {
        targets = []

        // Systemd unit name
        rule {
          source_labels = ["__journal__systemd_unit"]
          target_label  = "systemd_unit"
        }

        // Transport type (stdout, syslog, kernel, audit, etc.)
        rule {
          source_labels = ["__journal__transport"]
          target_label  = "journal_transport"
        }

        // Priority (info, warning, error)
        rule {
          source_labels = ["__journal_priority_keyword"]
          target_label  = "level"
        }
      }

      // ============================================
      // HOST JOURNALD PROCESSING
      // ============================================

      // Add static labels and forward journald logs to Loki
      loki.process "host_journal" {
        stage.static_labels {
          values = {
            cluster = env("CLUSTER_NAME"),
            host    = env("NODE_NAME"),
            zone    = env("ZONE"),
            job     = "journald",
            service_name = "journald",
          }
        }

        forward_to = [loki.write.loki_srv.receiver]
      }

  extraEnv:
    - name: NODE_NAME
      valueFrom:
        fieldRef:
          fieldPath: spec.nodeName
    - name: CLUSTER_NAME
      value: casa
    - name: ZONE
      value: casa-vlan
    - name: LOKI_URL
      valueFrom:
        secretKeyRef:
          name: alloy-global
          key: loki_url