Sitecore 9 on Azure PaaS comes with App Insights as a default. Out of the box, there are a bunch of metrics captured. This counts for a lot of data that comes at a cost. Even a clean install with no traffic reaches the default daily cap. This can be increased but comes at a cost.
Sitecore wrote an article https://doc.sitecore.net/sitecore_experience_platform/setting_up_and_maintaining/sitecore_on_azure/analytics/configure_application_insights_post_deployment to describe how to tweak you app insights.
I would like to reduce the metrics being measured under the counterLoader/includedCounters node. Does someone have experience with this? Which metrics are actually usefull and should definitly be retained, which one are more nice to haves? I know this is can depend on the kind of project but if there are any general guidelines, I would welcome them.