A small fastify server that exports database statistics as prometheus metrics from one or more mongodb databases.
To run the service, you have to place the following environment variables in a .env file:
MONGODB_URL: mongodb connection string;MONGODB_NAMES: comma separated list of database names
The file can be simply named .env and placed in the same directory of the service, or in another location by setting an environment variable ENV_FILE.
Then, just launch npm start
The service listens on port 3000 and expose a /-/metrics GET endpoint. The service will respond with default prometheus metrics, along with the numeric values from the mongodb client stats method representend as gauge metrics.
# HELP collections metric measuring collections value from database stats.
# TYPE collections gauge
collections{database="test"} 0
# HELP views metric measuring views value from database stats.
# TYPE views gauge
views{database="test"} 0
# HELP objects metric measuring objects value from database stats.
# TYPE objects gauge
objects{database="test"} 0
# HELP avgObjSize metric measuring avgObjSize value from database stats.
# TYPE avgObjSize gauge
avgObjSize{database="test"} 0
# HELP dataSize metric measuring dataSize value from database stats.
# TYPE dataSize gauge
dataSize{database="test"} 0
# HELP storageSize metric measuring storageSize value from database stats.
# TYPE storageSize gauge
storageSize{database="test"} 0
# HELP totalSize metric measuring totalSize value from database stats.
# TYPE totalSize gauge
totalSize{database="test"} 0
# HELP indexes metric measuring indexes value from database stats.
# TYPE indexes gauge
indexes{database="test"} 0
# HELP indexSize metric measuring indexSize value from database stats.
# TYPE indexSize gauge
indexSize{database="test"} 0
# HELP scaleFactor metric measuring scaleFactor value from database stats.
# TYPE scaleFactor gauge
scaleFactor{database="test"} 1
# HELP fileSize metric measuring fileSize value from database stats.
# TYPE fileSize gauge
fileSize{database="test"} 0
# HELP fsUsedSize metric measuring fsUsedSize value from database stats.
# TYPE fsUsedSize gauge
fsUsedSize{database="test"} 0
# HELP fsTotalSize metric measuring fsTotalSize value from database stats.
# TYPE fsTotalSize gauge
fsTotalSize{database="test"} 0
# HELP ok metric measuring ok value from database stats.
# TYPE ok gauge
ok{database="test"} 1