GetNonPrepPlanCacheUnsupportedCounter get non-prepared plan cache unsupported counter.

GetPlanCacheCloneDuration get different plan cache clone duration.

GetPlanCacheHitCounter get different plan cache hit counter.

GetPlanCacheInstanceEvict get instance plan cache evict counter.

GetPlanCacheInstanceMemoryUsage get different plan memory usage counter of plan cache.

GetPlanCacheInstanceNumCounter get different plan counter of plan cache.

GetPlanCacheLookupDuration get different plan cache lookup duration.

GetPlanCacheMissCounter get different plan cache miss counter.

InitMetricsVars init planner core metrics vars.

planner core metrics vars.

planner core metrics vars.