There are no metrics for the fetcher. As minimum we should have counters for:
- successful fetcher invocations
- failed fetcher invocations
It would also be useful to know the fetch time, though that could be highly variable depending on the cluster usage.
- is related to
MESOS-4760 Expose metrics and gauges for fetcher cache usage and hit rate
- relates to
MESOS-7782 Add fetcher cache size metrics.