Thanks Guilmxm, about the servers with issue:
The type of OS and version:
A very old version of RedHat Linux (2.6 kernel)
The python version in use (run: python --version):
Should be Python 2.4.6 or something older, so the add-on is using Perl instead of Python.
The type and version of Splunk (full vs UF and version)
Splunk Enterprise 6.5.3 with Splunk Forwarder 6.5.3
TA-nmon-1.2.48 is running stable on the servers with interval around 10 seconds.
(I created different TA-nmon with create_agent.py for different server type)
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