Local caching metrics

Use metrics to monitor health for local caching.

Global tags

cache=<name>

The cache name.

Size

Monitor the number of entries in your local cache.

Metric Description

cache_size

The number of cached entries.

Data Access

The following metrics monitor the cache accesses, such as lookup and evictions.

Reads

Tags

result=hit|miss

The result of the read/lookup operation. If the value is hit, the entry was found in the cache.

The read requests can be monitored using a single metric.

Metric Description

cache_gets_total

The total number of cache lookups.

Hit Ratio for read operation

An expression can be used to compute the hit ratio for a cache in systems such as Prometheus. For example, the hit ratio for read operations can be expressed as:

cache_gets_total{result="hit"} / cache_gets_total

Evictions

When a cache is limited, eviction is the process of removing the least used entries to make space available for new entries to be cached.

Metric Description

cache_evictions_count

The number of times the cache was evicted.
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