chore(tasks): emit agent-server boot-time metric for the runs dashboard#66348
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Problem
Cloud-task agent-server spawn time — node process start to a usable session (
hasSession=true, what the backend health poll waits on) — isn't on any dashboard. We can't see boot latency or catch regressions for background-agent runs. We want it as a first-class series on the "Cloud background agents runs" dashboard.Changes
start_agent_serveractivity reads the agent-server'sbootMsfrom/healthonce the server is healthy, and records it onto the existingtasks_process_sandbox_step_latencyhistogram withstep="agent_server_boot".Sandbox.read_agent_server_boot_ms()— Modal and Docker each curl/healthon their own in-sandbox port (8080 / 47821); the base returnsNone