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You can see a complete example of a collect plugin in the Host_Resources plugin (Released in 9.1.2). There are many more plugins added to the NMIS9 project.
Porting Plugins from NMIS8 to NMIS9
Existing plugins in NMIS8 were ported to NMIS9, so there are many good examples on the changes to the API calls required. You can find all the ported and any new plugins in GitHub here: https://github.com/Opmantek/nmis9/tree/nmis9_dev/conf-default/plugins
Review the NMIS8 Host_Resources and NMIS9 Host_Resources plugin as a way to see how to easily port one.
If you have a support contract and need some assistance to port your plugin, you can open a support case: FirstWave Support