Runtime Diagnostics is a point-in-time diagnostics tool that should be used 
when you think there is something wrong on your system and don't know what it 
could be or where you should start your investigation.  It is invoked by F 
HZR,ANALYZE (starting in R13) after it has been started.  Prior to R13, it was 
invoked using its start command.

PFA uses Runtime Diagnostics to corroborate a "too low" condition is some of 
PFA's checks.  When PFA thinks a rate is too low, it invokes Runtime 
Diagnostics and if there's an event, issues the PFA exception and includes the 
Runtime Diagnostics events in the PFA report.  This output is what you would 
have been seeing in the PFA_SMF_ARRIVAL_RATE check's report.

There has been a lot of recent work to reduce the number of exceptions from 
PFA.  Therefore, I would encourage you to get all the latest PFA PTFs and to 
stay current on those. There are some additional PTFs that should be available 
soon in this "too low" checking as well.

More information on both Runtime Diagnostics and PFA as well as the integration 
between them can be found in z/OS Problem Management.

Karla Arndt
z/OS Predictive Failure Analysis and Runtime Diagnostics

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