Monitor Confluence plugin updates via UPM and Nagios

Question

I would like to monitor Confluence plugin updates through Nagios. Whenever an update becomes available, Nagios should trigger a warning.

I can do the Nagios part, including any scripting that would be needed there. The key question is really how can I query Confluence whether it has any plugin updates available, e.g. via REST.

I have discovered the UPM rest API at /rest/plugins/1.0/, but while it provides a list of installed plugins, this does not seem to include whether an update is available.

M_S_ · Answer

Although it may be feasible, it does not appear to be a good solution. The monitoring would need to query confluence to check what plugins are installed with which versions, parse the REST output and then also check the marketplace, somehow parse that HTML(? - uh) and then compare these. 
Quite some work, specifically since confluence itself already has that logic built-in - when I navigate to the plugins page it tells me which plugins need updates.

My hope was for some REST interface rather than parsing HTML which breaks easily (with updates).

Guilherme Nedel · Answer

Hello M.S. by any chance would be monitoring Marketplace plugin pages feasible, instead of attempting to retrieve the info from the application itself? For instance, this addon page gets updated with version whenever there are new iterations. Thoughts?