Merge branch 'am-add-instrumentation-class-usage-warning-to-docs' into 'master'

Update info note for instrumentation class usage

See merge request gitlab-org/gitlab!81892

doc/development/service_ping/implement.md

@@ -26,13 +26,12 @@ To implement a new metric in Service Ping, follow these steps:
 1. [Verify your metric](#verify-your-metric)
 1. [Set up and test Service Ping locally](#set-up-and-test-service-ping-locally)
 
-NOTE:
-When you add or change a Service Metric, you must migrate metrics to [instrumentation classes](metrics_instrumentation.md).
-For information about the progress on migrating Service ping metrics, see this [epic](https://gitlab.com/groups/gitlab-org/-/epics/5547).
-
 ## Instrumentation classes
 
-Implementing metrics direct in `usage_data.rb` is deprecated, we recommend you use [instrumentation classes](metrics_instrumentation.md).
+NOTE:
+Implementing metrics directly in `usage_data.rb` is deprecated.
+When you add or change a Service Ping Metric, you must migrate metrics to [instrumentation classes](metrics_instrumentation.md).
+For information about the progress on migrating Service Ping metrics, see this [epic](https://gitlab.com/groups/gitlab-org/-/epics/5547).
 
 For example, we have the following instrumentation class:
 `lib/gitlab/usage/metrics/instrumentations/count_boards_metric.rb`.