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Metrician
API Reference

Memcached Metrics with InstrumentalD

The best way to get Memcached metrics into Instrumental is with InstrumentalD, the fast and reliable server agent created by the Instrumental team. By using InstrumentalD to collect Memcached metrics, you'll get premade Memcached graphs and unlock the full power of our Query Language.

Quick Start
Configuring InstrumentalD
Memcached Metrics Collected
How many metrics can I expect from InstrumentalD?
Dashboard

Quick Start

Check out our Installation Instructions for more details. Otherwise, here's the bare minimum to get up and running.

brew install instrumental/instrumentald/instrumentald
echo 'memcached = ["localhost:11211"]' >> instrumentald.toml
instrumentald -c instrumentald.toml -k PROJECT_TOKEN

curl https://packagecloud.io/install/repositories/expectedbehavior/instrumental/script.deb.sh | sudo bash
sudo apt-get install instrumentald
echo 'project_token = "PROJECT_TOKEN"' | sudo tee /etc/instrumentald.toml
echo 'memcached = ["localhost:11211"]' | sudo tee -a /etc/instrumentald.toml
sudo systemctl restart instrumentald

curl https://packagecloud.io/install/repositories/expectedbehavior/instrumental/script.rpm.sh | sudo bash
sudo yum install instrumentald
echo 'project_token = "PROJECT_TOKEN"' | sudo tee /etc/instrumentald.toml
echo 'memcached = ["localhost:11211"]' | sudo tee -a /etc/instrumentald.toml
sudo service instrumentald restart

Configuring InstrumentalD

InstrumentalD collects the metrics below from as many Memcached servers as configured. Here's a basic example of the Memcached config:

memcached = ["localhost:11211"]

Everything you need to know about configuring InstrumentalD, including more information about Memcached config, can be found in the InstrumentalD Configuration docs.

Metrics Collected

Memcached metrics collected by InstrumentalD follow this pattern:

memcached.<host from connection string>.<metric>

The following metrics are collected:
`bytes`	Bytes currently used for caching items
`bytes_read`	Number of inbound bytes received by this server since startup
`bytes_written`	Number of outbound bytes sent by this server since startup
`cas_hits`	Number of successful "cas" commands since startup
`cas_misses`	Number of failed "cas" commands since startup
`cmd_get`	Number of "get" commands received since server startup not counting if they were successful or not
`cmd_set`	Number of "set" commands serviced since startup
`conn_yields`	The number of times any client has hit the maximum number of requests per event limit (-R on command line)
`curr_connections`	Number of open connections to this memcached server
`curr_items`	Number of items currently in this server's cache
`decr_hits`	Number of "decr" calls to existing keys
`decr_misses`	Number of "decr" command calls to undefined keys
`delete_hits`	Number of "delete" calls to existing keys
`delete_misses`	Number of "delete" commands for keys not existing within the cache
`evictions`	Number of objects removed from the cache to free up memory for new items because memcached reached it's maximum memory setting (limit_maxbytes)
`get_hits`	Number of successful "get" commands (cache hits) since startup
`get_misses`	Number of failed "get" commands (cache misses) since startup
`incr_hits`	Number of successful "incr" commands since startup
`incr_misses`	Number of failed "incr" commands since startup
`limit_maxbytes`	Maximum configured cache size in bytes

How many metrics can I expect from InstrumentalD?

InstrumentalD will collect 20 metrics for each server configured.

Dashboard

Here are the graphs included in our Memcached Dashboard. It's a great way to get started visualizing these metrics.