[SOLR-12834] Expose ram based cache eviction statistics from FastLRUCache

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 8.3
• Component/s: metrics
• Assignee: Unassigned
• Reporter: Shalin Shekhar Mangar
• Created: 05/Oct/18 02:28
• Updated: 31/Jul/19 10:30
• Resolved: 31/Jul/19 10:30

Description

The LRUCache used for query result caches expose the following stats:

1. maxRamMB
2. ramBytesUsed
3. evictionsRamUsage

The last one is not relevant to FastLRUCache as its behavior is to either evict by size or by heap but not both. However, the first two should be exposed by FastLRUCache as well.