Collect system information (manual method for onprem customers)
Version of AEM and service pack applied; the following output helps: curl -u admin:admin http://localhost:4502/crx/packmgr/service.jsp?cmd=ls package_list.xml (adapt it for your login/password and host/port)
Apache Felix Configuration Status, under http://localhost:4502/system/console/config/configuration-status.zip (default installation)
When instructions are provided to reproduce the issue, check that it works on an instance that is rebuilt based on the same instructions. If you cannot reproduce it somewhere else, it could be difficult for the support team to reproduce it too. And that could be a hint that the issue needs more content or description.
A package or some clear steps with screenshot or screen recording can be useful.
Exact timestamp of when the problem was observed or a clear time range is also a good practice to add in the description of the issue.
If the issue is performance-related, provide thread dumps as described in the article Analyze Slow and Blocked Processes. Provide at least ten thread dumps with interval of 10 seconds.
If you can use prof.jsp, use at least a stack depth of 64 with interval of 200 ms. Collect this data for about five minutes.
Memory-related issues If there is a memory-related issue (out of memory message appear in your logs for example), provide the information as described in the article Analyze Memory Problems. Do this step for all instances in the cluster if applicable.
Send/attach the collected data
Send all in a single archive. If that is too large for the ticket, please ask your support representative for an alternative solution. Provide the information in the ticket at creation or as soon as possible after creation with the additional information and description that can help analyze the problem. Change the loglevel to DEBUG (as per the related issue)
To get better quality in qualifying your ticket, use the Apache Felix Webconsole › Configuration panel. Add a Logger configuration for DEBUG messages for the different part of the code related to your issues.
com.day.cq.replication.impl for replication issues
org.apache.sling.event.impl for Eventing-related issues
Another useful information that can help resolve the issue faster is finding the package or category name for the logger by opening the bundle information in Apache Felix Webconsole › Bundles panel.