Monitoring and collecting data from Memcached
Memcached is a free & open source, high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load. Memcached is an in-memory key-value store for small chunks of arbitrary data (strings, objects) from results of database calls, API calls, or page rendering.
More information on: https://memcached.org/
How it works
The Memcached plugin gathers statistics such as the number of connections, the number of gets, etc. using the Memcached interface.
These statistics are gathered in Memcached by default and no additional configuration is required. Just provide the connection details for the Memcached server and the plugin is ready to go.
The minimal supported version of Memcached is 1.4.
The plugin needs to be installed together with a CoScale agent, instructions on how to install the CoScale agent can be found here. If you want to monitor Memcached inside Docker containers using CoScale, check out the instructions here.
The CoScale plugin requires the host and port to the local Memcached service. It is possible to supply multiple hosts and ports if you are running multiple Memcached instances on the same machine.
This plugin can be configured to perform a command on your Memcached. This active monitoring allows us to calculate the uptime of the service and the response time of the command.
A valid Memcached command (eg. get my-test-key) should be provided.
|Memcached active check latency||s||Memcached port|
|Memcached active check uptime||%||Memcached port|
Memcached / Cache
|Memcached bytes in cache||b||Memcached port|
|Memcached evictions||#/s||Memcached port|
|Memcached hash table size||b||Memcached port|
|Memcached items in cache||items||Memcached port|
|Memcached max size cache||b||Memcached port|
|Memcached reclaimed||#/s||Memcached port|
|Memcached unfetched evicted||#/s||Memcached port|
|Memcached unfetched expired||#/s||Memcached port|
|Total Memcached items||items||Memcached port|
Memcached / Commands
|Memcached auth commands||#/s||Memcached port|
|Memcached auth errors||#/s||Memcached port|
|Memcached flush commands||#/s||Memcached port|
|Memcached get commands||#/s||Memcached port|
|Memcached set commands||#/s||Memcached port|
|Memcached touch commands||#/s||Memcached port|
Memcached / Connections
|Accepting connections by Memcached||conn||Memcached port|
|Current connections to Memcached||conn||Memcached port|
|Max connections reached to Memcached||conn||Memcached port|
|Memcached connection structures||#||Memcached port|
|Memcached reversed file descriptors||#||Memcached port|
|Total connections to Memcached||conn||Memcached port|
|Yielded connections to Memcached||conn||Memcached port|
Memcached / Hits and Misses
|Memcached check and set bad value||#/s||Memcached port|
|Memcached check and set hits||#/s||Memcached port|
|Memcached check and set misses||#/s||Memcached port|
|Memcached decrement hits||#/s||Memcached port|
|Memcached decrement misses||#/s||Memcached port|
|Memcached delete hits||#/s||Memcached port|
|Memcached delete misses||#/s||Memcached port|
|Memcached get hits||#/s||Memcached port|
|Memcached get misses||#/s||Memcached port|
|Memcached increment hits||#/s||Memcached port|
|Memcached increment misses||#/s||Memcached port|
|Memcached touch hits||#/s||Memcached port|
|Memcached touch misses||#/s||Memcached port|
Memcached / Resources
|Memcached bytes read||b||Memcached port|
|Memcached bytes written||b||Memcached port|
|Memcached process id||Memcached port|
|Memcached system time||%||Memcached port|
|Memcached threads||threads||Memcached port|
|Memcached uptime||s||Memcached port|
|Memcached user time||%||Memcached port|
|MEMCACHED service state watcher||State watcher||status|