Couple of simple steps to debug munin plugins
First check if munin recognize the plugin.
Execute munin plugin in regular mode:
munin-run plugin_name
you will get output in format of:
some.value XX

then execute munin plugin in configuration mode:
munin-run plugin_name config

you will get output in format of:

graph_title Great Plugin
graph_args --upper-limit 100 -l 0
graph_vlabel %
graph_category some_category
graph_info This is the best munin plugin ever.
something.label LABEL

If you have any problems they can be related to the plugin having a permission problem.

Next step is to test the plugin connection via port 4949
Run a telnet on munin node port 4949

telnet munin-node.example.com 4949

You will get output in format of:

Trying munin-node.example.com...
Connected to munin-node.example.com.
Escape character is '^]'.
# munin node at munin-node.example.com

then type in console:

fetch plugin_name
or
fetch plugin_name config

It will output something similar to munin-run.

Then plugin works with munin-run command but not through telnet execution, you  most likely to have a local PATH problem. Tip: Set env.PATH for the plugin in the plugin's environment file.


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