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diff --git a/collectors/python.d.plugin/mongodb/README.md b/collectors/python.d.plugin/mongodb/README.md new file mode 100644 index 0000000..ac8930d --- /dev/null +++ b/collectors/python.d.plugin/mongodb/README.md @@ -0,0 +1,170 @@ +# mongodb + +Module monitor mongodb performance and health metrics + +**Requirements:** + * `python-pymongo` package v2.4+. + +You need to install it manually. + + +Number of charts depends on mongodb version, storage engine and other features (replication): + +1. **Read requests**: + * query + * getmore (operation the cursor executes to get additional data from query) + +2. **Write requests**: + * insert + * delete + * update + +3. **Active clients**: + * readers (number of clients with read operations in progress or queued) + * writers (number of clients with write operations in progress or queued) + +4. **Journal transactions**: + * commits (count of transactions that have been written to the journal) + +5. **Data written to the journal**: + * volume (volume of data) + +6. **Background flush** (MMAPv1): + * average ms (average time taken by flushes to execute) + * last ms (time taken by the last flush) + +8. **Read tickets** (WiredTiger): + * in use (number of read tickets in use) + * available (number of available read tickets remaining) + +9. **Write tickets** (WiredTiger): + * in use (number of write tickets in use) + * available (number of available write tickets remaining) + +10. **Cursors**: + * opened (number of cursors currently opened by MongoDB for clients) + * timedOut (number of cursors that have timed) + * noTimeout (number of open cursors with timeout disabled) + +11. **Connections**: + * connected (number of clients currently connected to the database server) + * unused (number of unused connections available for new clients) + +12. **Memory usage metrics**: + * virtual + * resident (amount of memory used by the database process) + * mapped + * non mapped + +13. **Page faults**: + * page faults (number of times MongoDB had to request from disk) + +14. **Cache metrics** (WiredTiger): + * percentage of bytes currently in the cache (amount of space taken by cached data) + * percantage of tracked dirty bytes in the cache (amount of space taken by dirty data) + +15. **Pages evicted from cache** (WiredTiger): + * modified + * unmodified + +16. **Queued requests**: + * readers (number of read request currently queued) + * writers (number of write request currently queued) + +17. **Errors**: + * msg (number of message assertions raised) + * warning (number of warning assertions raised) + * regular (number of regular assertions raised) + * user (number of assertions corresponding to errors generated by users) + +18. **Storage metrics** (one chart for every database) + * dataSize (size of all documents + padding in the database) + * indexSize (size of all indexes in the database) + * storageSize (size of all extents in the database) + +19. **Documents in the database** (one chart for all databases) + * documents (number of objects in the database among all the collections) + +20. **tcmalloc metrics** + * central cache free + * current total thread cache + * pageheap free + * pageheap unmapped + * thread cache free + * transfer cache free + * heap size + +21. **Commands total/failed rate** + * count + * createIndex + * delete + * eval + * findAndModify + * insert + +22. **Locks metrics** (acquireCount metrics - number of times the lock was acquired in the specified mode) + * Global lock + * Database lock + * Collection lock + * Metadata lock + * oplog lock + +23. **Replica set members state** + * state + +24. **Oplog window** + * window (interval of time between the oldest and the latest entries in the oplog) + +25. **Replication lag** + * member (time when last entry from the oplog was applied for every member) + +26. **Replication set member heartbeat latency** + * member (time when last heartbeat was received from replica set member) + +### prerequisite +Create a read-only user for the netdata in the admin database. + +1. Authenticate as the admin user. + +``` +use admin +db.auth("admin", "<MONGODB_ADMIN_PASSWORD>") +``` + +2. Create a user. + +``` +# MongoDB 2.x. +db.addUser("netdata", "<UNIQUE_PASSWORD>", true) + +# MongoDB 3.x or higher. +db.createUser({ + "user":"netdata", + "pwd": "<UNIQUE_PASSWORD>", + "roles" : [ + {role: 'read', db: 'admin' }, + {role: 'clusterMonitor', db: 'admin'}, + {role: 'read', db: 'local' } + ] +}) +``` + +### configuration + +Sample: + +```yaml +local: + name : 'local' + host : '127.0.0.1' + port : 27017 + user : 'netdata' + pass : 'netdata' + +``` + +If no configuration is given, module will attempt to connect to mongodb daemon on `127.0.0.1:27017` address + +--- + +[]() |