[DOCS-16595] [SERVER] Investigate changes in SERVER-75678: Consider adding a plan cache serverStatus counter for queries which are not eligible for caching Created: 19/Jan/24  Updated: 07/Feb/24  Resolved: 07/Feb/24

Status: Closed
Project: Documentation
Component/s: manual, Server
Affects Version/s: None
Fix Version/s: 7.3.0-rc0

Type: Task Priority: Minor - P4
Reporter: Backlog - Core Eng Program Management Team Assignee: Alison Huh
Resolution: Fixed Votes: 0
Labels: backlog, feature
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Documented
documents SERVER-75678 Consider adding a plan cache serverSt... Closed
Participants:
Days since reply: 2 weeks, 5 days ago

 Description   
Original Downstream Change Summary

We now differentiate from plan cache misses and skips (queries whose plan is never even attempted to cache)

Description of Linked Ticket

This is a follow up ticket from SERVER-70025.

Currently we only count cache plan cache hits and misses, regardless of the query type. That is, we expect a plan for the given query to be in the cache, and as such can be recovered from the cache, or missed from the cache, and needs to be replanned.

However, there is a difference between "didn't use cache because there wasn't a cache entry" and "didn't use cache because this query is ineligible for caching". 

We may want to consider adding a third counter (in additional to "hits" and "misses") to account for this difference. 


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