# Loki Configuration
# Task P2-2.3: Centralized Logging with ELK/Loki Stack
# Version: 2.9.0
#
# Loki is a horizontally-scalable, highly-available, multi-tenant log aggregation system
# inspired by Prometheus. It is designed to be very cost effective and easy to operate.

auth_enabled: false

ingester:
  # Chunk-related settings for ingestion
  chunk_idle_period: 3m
  chunk_retain_period: 1m
  max_chunk_age: 1h
  chunk_encoding: snappy

  # Performance tuning
  max_streams_errors: 100
  max_streams: 1000
  max_stream_delay: 5s

  # Flush settings
  lifecycler:
    ring:
      kvstore:
        store: inmemory
      replication_factor: 1
    num_tokens: 128
    heartbeat_timeout: 5m
    interface_names:
      - eth0

limits_config:
  # Enforce rate limiting per stream
  rate_limit_bytes: 100MB
  rate_limit_enabled: true

  # Stream limits
  max_entries_limit_per_second: 10000
  max_streams_per_user: 10000

  # Global retention policy: 30 days
  retention_period: 720h  # 720h = 30 days

  # Split logs into multiple lines after this many characters
  max_line_size: 256KB

  # Cardinality limits
  cardinality_limit: 100000
  enforce_metric_name: false

schema_config:
  configs:
    - from: 2020-10-24
      store: boltdb-shipper
      object_store: filesystem
      schema: v11
      index:
        prefix: index_
        period: 24h

server:
  http_listen_port: 3100
  http_server_read_timeout: 600s
  http_server_write_timeout: 600s
  log_level: info

storage_config:
  # Use filesystem storage for development
  filesystem:
    directory: /loki/chunks

  # Index storage configuration
  index_cache_validity: 5m
  cache_config:
    enable_fifocache: true
    default_validity: 1h
    background:
      writeback_goroutines: 10
      writeback_buffer: 10000
    memcached:
      batch_size: 1024
      parallelism: 100

chunk_store_config:
  # Maximum number of parallel workers processing chunks
  max_look_back_period: 0s

  # Cache config for the chunk store
  cache_config:
    enable_fifocache: true
    default_validity: 1h

table_manager:
  # Enable table manager for automatic table creation and retention
  enabled: true

  # Period for creation of new tables
  poll_interval: 10m

  # Retention period for old tables
  retention_deletes_enabled: true
  retention_period: 720h  # 30 days

  # Grace period before deleting tables
  creation_grace_period: 10m

query_range:
  # Cache config for query results
  cache_config:
    enable_fifocache: true
    default_validity: 1m
    background:
      writeback_goroutines: 10
      writeback_buffer: 10000

# Querier settings
querier:
  # Max concurrent queries
  max_concurrent: 100

  # Query timeout
  query_timeout: 2m

  # Engine timeout
  engine:
    timeout: 2m

# Distributor settings
distributor:
  # Rate limit
  rate_limit_enabled: false

  # Ring configuration
  ring:
    kvstore:
      store: inmemory

# Compactor settings for log retention
compactor:
  # Enable compaction
  compaction_interval: 10m

  # Number of workers
  max_compaction_parallel_shards: 2

  # Retention settings
  retention_enabled: true
  retention_delete_delay: 2h
  retention_delete_worker_count: 150

  # Working directory for temporary files
  working_directory: /loki/compactor
  shared_store: filesystem

runtime_config:
  # Configuration file for runtime updates
  # Useful for overrides without restart
  file: /etc/loki/runtime.yaml
  period: 10s

# Tracing configuration (optional)
# Uncomment to enable distributed tracing
# tracing:
#   enabled: false

# Monitoring/Metrics
# The metrics below are exposed on port 3100 at /metrics
# Useful for Prometheus scraping
metrics:
  enabled: true
  namespace: loki