Batch log queries and metrics#2208

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graydon wants to merge 3 commits intostellar:masterfrom

graydon:batch-log-queries-and-metrics

Commits on Jul 24, 2019

util: add CachedLogLevel helper to alleviate frequent log-level lookups.
graydon
committed

Commits on Jul 25, 2019

util: add Batch{Meter,Timer} helpers to alleviate frequent medida writes.
graydon
committed
Use batch log-level lookups and metric writes in various hot paths.
graydon
committed