Messages relating to File Integrity checks means that one of the 'default' files from an installation is missing or has been changed.
You should not modify files in any ./default folder. (or outside of ./local for that matter)
Periodically (and after a restart) Splunk will compare the installation files with the manifiest, and report files that have been modified.
The message should indicate which file has changed, you should then replace/or revert this to the original version, and if necessary make the ammendment to the relevent file in ./local
If you want to retrigger the message so you can review which files are affected you can restart the Splunk server, or without restarting review the events in index=_internal
@nickhillscpl Thanks for your response. I am receiving lot of messages in Splunk. For example i am receiving File Integrity checks found message frequently in Splunk web. Now i want only once to give the message. Can you please help?