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J. Scott Miller
3e46c7986f
Moves the `coderd_agents_first_connection_seconds` histogram from the polling-based `prometheusmetrics.Agents()` loop to the event-driven `agentConnectionMonitor.init()` path. The metric is now recorded exactly once when an agent first connects over the RPC websocket, instead of being retroactively computed each polling tick. The `username` and `workspace_name` labels are removed to reduce cardinality; only `template_name` and `agent_name` are retained. Adds unit tests covering both the happy path (first connection recorded) and the negative-duration guard (clock skew logs a warning, no sample emitted).