Check_MK Werk 1409: Extended Check_MK-API: check function may return None

ID: 1409 Title: Extended Check_MK-API: check function may return None Component: Checks & Agents Level: 2 Class: New Feature Version: 1.2.5i6 A check function may now return <tt>None</tt> (or simply end without returning anything). This will no longer create an exception but return state <tt>UNKNOWN</tt> and - depending on the type of the check - one of the following outputs: <tt>Item not found in SNMP data</tt> <tt>Item not found in agent output</tt> This means that for the typical check that loops through the agent output looking for its item now does not need to manually do a C+: return 3, "Something not found in agent output" C-: anymore. This is now the default case. This has several advantages: <ul> <li>You save some code in the check implementation.</li> <li>The output of the various checks is unified.</li> <li>A future Check_MK version can easily have a rule for changing the state in such cases from UNKNOWN to WARN or CRIT.</li> </ul>