This ticket came from the investigation of support issue: http://jira.hyperic.com/browse/SUPPORT-6347
Sendmail plugin's ptql does not account for the sendmail client processes, this causes the availability metric to change when multiple processes that match the ptql are found.
See the customers description for some background details.
It is recommended to add the following (or possibly an alternate version) to the top level availability process.query in the agent configuration and to the root process service config. <current ptql>,Args.-1.re=connections
Other possibilities (instead of the regular expression) could be: "ew=connections" or "ct=connections"