Investigate regression in memory usage in v7

[CharlieC3]

We're seeing more OOMs in v7 than we did in v6. We may need to profile the memory usage again to identity key areas for performance improvements and address them.

[rafaelcr]

We should perform tests in the new clusters by reducing pod memory in staging and sending prod traffic into it so we can get a memory dump once it crashes

[zone117x]

Is this still an issue? Did we fix it by switching to the slim docker image and upgrading nodejs version?

[CharlieC3]

@zone117x Yeah this is still an issue unfortunately. Changing the LB algo to least_request helped cover the symptoms, but OOMs are still occurring frequently, just less so than before.