Github user srdo commented on a diff in the pull request:
https://github.com/apache/storm/pull/2200#discussion_r126514663
--- Diff: docs/Metrics.md ---
@@ -125,3 +126,193 @@ The [builtin
metrics]({{page.git-blob-base}}/storm-client/src/jvm/org/apache/sto
[BuiltinMetricsUtil.java]({{page.git-blob-base}}/storm-client/src/jvm/org/apache/storm/daemon/metrics/BuiltinMetricsUtil.java)
sets up data structures for the built-in metrics, and facade methods that the
other framework components can use to update them. The metrics themselves are
calculated in the calling code -- see for example
[`ackSpoutMsg`]({{page.git-blob-base}}/storm-client/src/jvm/org/apache/storm/executor/Executor.java).
+#### Reporting Rate
+
+The rate at which built in metrics are reported is configurable through
the `topology.builtin.metrics.bucket.size.secs` metric. If you set this too
low it can overload the consumers
+and some metrics consumers expect metrics to show up at a fixed rate or
the numbers could be off, so please use caution when modifying this.
--- End diff --
I'm a little unsure what you're saying here. Is it possible to change the
bucket size dynamically at runtime, or are you saying that some consumers will
break if the topology isn't using the default bucket size?
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