If you are running Sitecore version 8.2.x, you are running MongoDB 3.4. Unfortunately, that also means you are impacted by the announcement by MongoDB that version 3.4 will reach end-of-life in January 2020.
You have some options on how you want to fix this and it sort of depends on how much tolerance your organization has for running production systems that don’t have commercial support from the vendor.
Over on the Sitecore Technical Marketing blog, I outlined a variety of options and provided a few FAQ answers:
St-Cyr Thoughts 