---
+# elasticsearch
+
+Module monitor elasticsearch performance and health metrics
+
+**Requirements:**
+ * python `requests` package.
+
+You need to install it manually. (python-requests or python3-requests depending on the version of python).
+
+
+It produces:
+
+1. **Search performance** charts:
+ * Number of queries, fetches
+ * Time spent on queries, fetches
+ * Query and fetch latency
+
+2. **Indexing performance** charts:
+ * Number of documents indexed, index refreshes, flushes
+ * Time spent on indexing, refreshing, flushing
+ * Indexing and flushing latency
+
+3. **Memory usage and garbace collection** charts:
+ * JVM heap currently in use, commited
+ * Count of garbage collections
+ * Time spent on garbage collections
+
+4. **Host metrics** charts:
+ * Available file descriptors in percent
+ * Opened HTTP connections
+ * Cluster communication transport metrics
+
+5. **Queues and rejections** charts:
+ * Number of queued/rejected threads in thread pool
+
+6. **Fielddata cache** charts:
+ * Fielddata cache size
+ * Fielddata evictions and circuit breaker tripped count
+
+7. **Cluster health API** charts:
+ * Cluster status
+ * Nodes and tasks statistics
+ * Shards statistics
+
+8. **Cluster stats API** charts:
+ * Nodes statistics
+ * Query cache statistics
+ * Docs statistics
+ * Store statistics
+ * Indices and shards statistics
+
+### configuration
+
+Sample:
+
+```yaml
+local:
+ host : 'ipaddress' # Server ip address or hostname
+ port : 'password' # Port on which elasticsearch listed
+ cluster_health : True/False # Calls to cluster health elasticsearch API. Enabled by default.
+ cluster_stats : True/False # Calls to cluster stats elasticsearch API. Enabled by default.
+```
+
+If no configuration is given, module will fail to run.
+
+---
+
# exim
Simple module executing `exim -bpc` to grab exim queue.
# haproxy
-Module monitors frontend and backend metrics such as bytes in, bytes out, session current, session in queue current.
+Module monitors frontend and backend metrics such as bytes in, bytes out, sessions current, sessions in queue current.
And health metrics such as backend servers status (server check should be used).
Plugin can obtain data from url **OR** unix socket.
It produces:
1. **Frontend** family charts
-* Kilobytes in/s
-* Kilobytes out/s
-* Sessions current
-* Sessions in queue current
+ * Kilobytes in/s
+ * Kilobytes out/s
+ * Sessions current
+ * Sessions in queue current
2. **Backend** family charts
-* Kilobytes in/s
-* Kilobytes out/s
-* Sessions current
-* Sessions in queue current
+ * Kilobytes in/s
+ * Kilobytes out/s
+ * Sessions current
+ * Sessions in queue current
3. **Health** chart
* number of failed servers for every backend (in DOWN state)
---
+# mongodb
+
+Module monitor mongodb performance and health metrics
+
+**Requirements:**
+ * `python-pymongo` package.
+
+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)
+
+
+### 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
+
+---
+
+
# mysql
Module monitors one or more mysql servers
So it will probably fail.
---
+
+# varnish cache
+
+Module uses the `varnishstat` command to provide varnish cache statistics.
+
+It produces:
+
+1. **Client metrics**
+ * session accepted
+ * session dropped
+ * good client requests received
+
+2. **All history hit rate ratio**
+ * cache hits in percent
+ * cache miss in percent
+ * cache hits for pass percent
+
+3. **Curent poll hit rate ratio**
+ * cache hits in percent
+ * cache miss in percent
+ * cache hits for pass percent
+
+4. **Thread-related metrics** (only for varnish version 4+)
+ * total number of threads
+ * threads created
+ * threads creation failed
+ * threads hit max
+ * length os session queue
+ * sessions queued for thread
+
+5. **Backend health**
+ * backend conn. success
+ * backend conn. not attempted
+ * backend conn. too many
+ * backend conn. failures
+ * backend conn. reuses
+ * backend conn. recycles
+ * backend conn. retry
+ * backend requests made
+
+6. **Memory usage**
+ * memory available in megabytes
+ * memory allocated in megabytes
+
+7. **Problems summary**
+ * session dropped
+ * session accept failures
+ * session pipe overflow
+ * backend conn. not attempted
+ * fetch failed (all causes)
+ * backend conn. too many
+ * threads hit max
+ * threads destroyed
+ * length of session queue
+ * HTTP header overflows
+ * ESI parse errors
+ * ESI parse warnings
+
+8. **Uptime**
+ * varnish instance uptime in seconds
+
+### configuration
+
+No configuration is needed.
+
+---
projects / netdata.git / blobdiff