ateom-gvisor: emit actor usage records - #2194
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The gVisor ateom now samples its actors on its own timer (--usage-sample-interval, default 1m) and writes one ate.actor.usage_sampled record per actor per sample. An activation also gets an initial record when it starts and a final one after a checkpoint or terminate succeeds, in that order. GetActiveWorkloadStats serves the latest sample, so a poll reads no cgroup. Every read goes through the activation's own state, so a re-host during a read cannot mix two activations' numbers.
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Part of #1748, split out of #1984: the gVisor ateom emits the actor usage records, using #2005's building blocks. #1984 keeps the atelet side.
--usage-sample-interval(default 1m) and writes oneate.actor.usage_sampledrecord per actor per sample.initialwhen it starts, thenperiodic, thenfinalafter a checkpoint or terminate succeeds. The final reading is taken before the snapshot, because a Full checkpoint stops the sandbox's cgroup.GetActiveWorkloadStatsserves the latest sample, so atelet's poll reads no cgroup.Until #1984 lands, atelet still writes its own stdout usage record, so each gVisor actor has two usage records, with different messages and keys.
Tested: unit tests. The combined change was tested on ate-dev earlier, with
initial,periodic, andfinalper epoch for both checkpoint and terminate.