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Operations Basics / Version 2404

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CoreMedia Cache

The CoreMedia cache (based on com.coremedia.cache.Cache) provides more detail and uses a different set of meter names. Metrics are collected per cache class, which can be selected with the class tag.

For example, you can request the current cache level for cache class com.coremedia.cap.heap with

http://localhost:8081/actuator/metrics/coremedia.cache.level
  ?tag=class:com.coremedia.cap.heap

The response will then provide the value for the cache level:

{
  "name": "coremedia.cache.level",
  "description": "The total weight of all values which are currently held in the cache",
  "baseUnit": null,
  "measurements": [{
      "statistic": "VALUE",
      "value": 1327946.0
  }],
  "availableTags": []
}

The following table lists available metrics for the CoreMedia cache. Some metrics support additional tags to further drill down into measurements. The tag class is available for all metrics to set cache class.

Meter NameTagsDescription

coremedia.cache.capacity

 

The configured capacity.

coremedia.cache.level

 

The total weight of all values currently held in the cache.

coremedia.cache.size

 

The number of entries in this cache.

coremedia.cache.gets

result:hit

The number of cache hits, which are cache lookups that returned a cached value.

coremedia.cache.gets

result:miss

The number of cache misses, which are cache lookups that had to evaluate a value.

coremedia.cache.puts

 

The number of values inserted into the cache, after successful evaluation or injection.

coremedia.cache.evictions

 

The number of values evicted from the cache.

coremedia.cache.updates

 

The number of values updated after re-computation.

coremedia.cache.removals

 

The number of values removed from the cache after invalidation.

coremedia.cache.evaluation.duration

 

The time the cache has spent evaluating values.

coremedia.cache.eviction.duration

 

The time the cache has spent evicting values.

Table 4.11. CoreMedia Cache Metrics


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