Fault Analyzer in Lotus Domino

• Run Fault Analyzer on Fault DBs on this server - Yes -- Enables the Fault Analyzer task on this server.
• Run Fault Analyzer on - All mail-in databases on this server or Specific mail-in databases
• Databases to run fault analyzer against - The Fault Analyzer task searches these database for Fault Report documents and determines whether the stack matches a crash that has already been seen by a user or server at that customer site.
• Remove attachments from duplicate faults - If Fault Analyzer locates duplicate fault reports, the new crash is reported as a response to the original crash and attachments are removed from the response document to save space in the database is Yes is selected.
• If a match is found, The new crash is made a child of the original crash,The “parent” that it matched against has its occurrence count incremented  and optionally has its attachments deleted

Note  This task works with Domino's diagnostic data collection tool.
If you do not enable the automatic load of Fault Analyzer, you can invoke it directly from a server console command

load faultanalyzer

Fault_analyzer_match_percentage=x to override    
Mail-in database changes occurrences count and resolved filed on parent crash