Zenoss uses the standard Python "logging" module for this. The levels are a bit counter-intuitive in that a lower numbers gives your more verbose logging.

<code>
50 = FATAL/CRITICAL
40 = ERROR
30 = WARNING
20 = INFO
10 = DEBUG
</code>

So setting logseverity to 10 in zenactions.conf (or any .conf file), or via the command line with the --logseverity option will give you all possible logging. The default is 20 or INFO.