In running the configuration wizard, i got:
Configuration Wizard: MongoDB Server - Step 1
Error: It looks like you are missing pymongo on your Nagios XI server.
So, i installed pymongo and it said that the installation was successful.
sudo apt-get install python3-pip
sudo pip3 install pymongo
Successfully installed pymongo
Now I go back and run configuration wizard and still get:
Configuration Wizard: MongoDB Server - Step 1
Error: It looks like you are missing pymongo on your Nagios XI server.
mongo db monitoring
Re: mongo db monitoring
It's worth mentioning that Nagios XI is not officially supported on Ubuntu and Debian systems. We only officially support clean minimal CentOS and RHEL systems. Not sure if this is the case with your system, but I saw apt-get and figured I would mention this 
Can you show us the contents of your /usr/local/nagios/libexec directory?
Can you show us the contents of your /usr/local/nagios/libexec directory?
Former Nagios employee
https://www.mcapra.com/
https://www.mcapra.com/
Re: mongo db monitoring
Thanks mcapra; attaching the files.
You do not have the required permissions to view the files attached to this post.
Re: mongo db monitoring
As @mcapra mentioned, Ubuntu / Debian is not supported for Nagios XI. Please use RHEL6/7 or CentOS6/7 on a clean, minimal system.
Former Nagios Employee