Tablet throttler: multi-metric support #58

Job	Run time
Set push variable	1s
Build and push vttestserver (mysql80)	1m 56s
Build and push lite (latest)	2m 8s
Build and push lite (percona80)	2m 9s
Build and push (bullseye, vtadmin)	1m 16s
Build and push (bullseye, vtorc)	45s
Build and push (bullseye, vtgate)	34s
Build and push (bullseye, vttablet)	40s
Build and push (bullseye, mysqlctld)	37s
Build and push (bullseye, mysqlctl)	33s
Build and push (bullseye, vtctl)	44s
Build and push (bullseye, vtctlclient)	43s
Build and push (bullseye, vtctld)	1m 21s
Build and push (bullseye, vtctldclient)	33s
Build and push (bullseye, logrotate)	26s
Build and push (bullseye, logtail)	23s
Build and push (bullseye, vtbackup)	37s
Build and push (bullseye, vtexplain)	42s
Build and push (bookworm, vtadmin)	1m 17s
Build and push (bookworm, vtorc)	38s
Build and push (bookworm, vtgate)	46s
Build and push (bookworm, vttablet)	51s
Build and push (bookworm, mysqlctld)	45s
Build and push (bookworm, mysqlctl)	29s
Build and push (bookworm, vtctl)	30s
Build and push (bookworm, vtctlclient)	31s
Build and push (bookworm, vtctld)	1m 16s
Build and push (bookworm, vtctldclient)	42s
Build and push (bookworm, logrotate)	13s
Build and push (bookworm, logtail)	19s
Build and push (bookworm, vtbackup)	35s
Build and push (bookworm, vtexplain)	41s
	25m 41s

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