Fixup some metrics bugs with push metrics (#39927)

Author: eseliger

doc/admin/observability/alerts.md

@@ -5931,7 +5931,7 @@ with your code hosts connections or networking issues affecting communication wi
 <details>
 <summary>Technical details</summary>
 
-Custom alert query: `last_over_time(sum(increase(src_executor_processor_errors_total{queue=~"${queue:regex}",job=~"^sourcegraph-executors.*"}[5m]))[5h:]) / (last_over_time(sum(increase(src_executor_processor_total{queue=~"${queue:regex}",job=~"^sourcegraph-executors.*"}[5m]))[5h:]) + last_over_time(sum(increase(src_executor_processor_errors_total{queue=~"${queue:regex}",job=~"^sourcegraph-executors.*"}[5m]))[5h:])) * 100`
+Custom alert query: `last_over_time(sum(increase(src_executor_processor_errors_total{queue=~"${queue:regex}",sg_job=~"^sourcegraph-executors.*"}[5m]))[5h:]) / (last_over_time(sum(increase(src_executor_processor_total{queue=~"${queue:regex}",sg_job=~"^sourcegraph-executors.*"}[5m]))[5h:]) + last_over_time(sum(increase(src_executor_processor_errors_total{queue=~"${queue:regex}",sg_job=~"^sourcegraph-executors.*"}[5m]))[5h:])) * 100`
 
 </details>