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monitoring/loki/loki.yml

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+# Loki — single-binary, filesystem-backed, no auth (localhost-only; Alloy is the only writer).
+# Tuned for an LXC: TSDB index, 15-day retention with the compactor enforcing deletes.
+auth_enabled: false
+
+server:
+  http_listen_address: 127.0.0.1
+  http_listen_port: 3100
+  grpc_listen_port: 9096
+  log_level: info
+
+common:
+  instance_addr: 127.0.0.1
+  path_prefix: /var/lib/loki
+  storage:
+    filesystem:
+      chunks_directory: /var/lib/loki/chunks
+      rules_directory: /var/lib/loki/rules
+  replication_factor: 1
+  ring:
+    kvstore:
+      store: inmemory
+
+schema_config:
+  configs:
+    - from: 2024-01-01
+      store: tsdb
+      object_store: filesystem
+      schema: v13
+      index:
+        prefix: index_
+        period: 24h
+
+limits_config:
+  retention_period: 360h          # 15 days
+  reject_old_samples: true
+  reject_old_samples_max_age: 168h
+  # Required so OTLP resource/scope attributes (and trace_id/span_id) land as structured metadata.
+  allow_structured_metadata: true
+  volume_enabled: true
+
+compactor:
+  working_directory: /var/lib/loki/compactor
+  compaction_interval: 10m
+  retention_enabled: true
+  retention_delete_delay: 2h
+  delete_request_store: filesystem
+
+query_range:
+  results_cache:
+    cache:
+      embedded_cache:
+        enabled: true
+        max_size_mb: 100
+
+ruler:
+  storage:
+    type: local
+    local:
+      directory: /var/lib/loki/rules