フリー問題

問題文

Which extension exposes live data from the Collector's receivers and exporters, including a page that helps find running spans that never end?

選択肢

1. The health_check extension, which reports whether the process is alive.
2. The debug exporter, which is an extension in recent versions.
3. The pprof extension, which profiles the Collector as it runs and is the recommended first step whenever telemetry appears to be missing from a pipeline.
4. The zPages extension, whose tracez page is useful for latency issues, deadlocks and instrumentation problems.