# mongodb-exporter — percona/mongodb_exporter for the stack Mongo.
# NOTE (verified 2026-10 against this stack's mongo:9.0 replset "overleaf"):
# percona 0.43 ships the rich collectors OFF by default (default run answers
# only mongodb_up + go/process self metrics). The --collector.* toggles are
# therefore part of the supported surface here — keep them.
services:
  mongodb-exporter:
    image: ${MONGODB_EXPORTER_IMAGE:-percona/mongodb_exporter:0.43.0}
    container_name: mongodb-exporter
    hostname: mongodb-exporter
    restart: unless-stopped
    command:
      - "--mongodb.uri=mongodb://${MONGO_HOSTNAME:-mongo}:${MONGO_PORT:-27017}/${MONGODB_DATABASE:-sharelatex}"
      # verified metric families: mongodb_ss_* (connections, oplog time, ...),
      # mongodb_dbstats_dataSize/storageSize/collections per database,
      # mongodb_replicasetstatus_*, mongodb_fs_*
      - "--collector.diagnosticdata"
      - "--collector.dbstats"
      - "--collector.dbstatsfreestorage"
      - "--collector.replicasetstatus"
    expose:
      - "9216"
    # scratch image: single binary, no shell — liveness = the binary still
    # starts. The HTTP SERVING proof lives in mongodb-exporter-probe
    # (same proven pattern as wakapi-probe).
    healthcheck:
      test: ["CMD", "/mongodb_exporter", "--version"]
      interval: 10s
      timeout: 5s
      retries: 6
      start_period: 15s
    networks:
      - overleaf-network

networks:
  overleaf-network:
    external: true