NoahKusaba commented on code in PR #2438:
URL: 
https://github.com/apache/datafusion-ballista/pull/2438#discussion_r3994560509


##########
docs/source/user-guide/metrics.md:
##########
@@ -23,20 +23,19 @@
 
 > This is optional scheduler feature which should be enabled with 
 > `prometheus-metrics` feature
 
-Built with default features, the ballista scheduler will automatically collect 
and expose a standard set of prometheus metrics.
-The metrics currently collected automatically include:
+Built with the `prometheus-metrics` feature, the ballista scheduler collects 
and exposes a standard set of
+prometheus metrics. The metrics collected are:
 
 - _job_exec_time_seconds_ - Histogram of successful job execution time in 
seconds
 - _planning_time_ms_ - Histogram of job planning time in milliseconds
-- _failed_ - Counter of failed jobs

Review Comment:
   Thanks for the feedback, I removed the stale name as you suggested.
   I also noticed the header says "7 metrics" but listed 8, with `failed`
   as the extra. Documented names and registered names now both come to 7 and 
match
   exactly (checked by extracting both sets, not by eye).
   
   Verified with `--features prometheus-metrics`, since the default build never
   compiles that file: check, fmt and `cargo doc` under `-D warnings` all pass.



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