It'd be nice to be able to generate metrics for additional commands, beyond "insert", "update", and "delete" [0]. We could just add a bunch of new commands to this hardcoded list, but that has a few problems:

1. It's not future-proof against new MongoDB releases adding new commands.
2. Our MongoDB deployment contains some custom diagnostic or administrative commands that wouldn't make sense to upstream.

Assuming this seems reasonable, I'm happy to provide a patch for this functionality.

[0] https://github.com/envoyproxy/envoy/blob/master/source/extensions/filters/network/mongo_proxy/mongo_stats.cc#L31