Consider moving away from promStatsdExporterContainer

[arkodg]

Description:

Describe the issue.

#2729 added support for enabling scraping prometheus metrics using a sidecar container based off prom/statsd-exporter:v0.18.0 .
Pulling this image is tricky for air gapped clusters and adds another configuration point for syncing an extra image into a private registry

Can this be avoided if ratelimit introduced a prom endpoint natively, tracked with envoyproxy/ratelimit#285

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Any extra documentation required to understand the issue.

[arkodg]

hey @shawnh2 interested in investigating the feasibility of this one ? There's a PR linked to the above issue, unsure what's missing to get it through the finish line
cc @zirain

[zirain]

I cannot recall all the details last time I tried(it's long ago), most likely because lyft/gostats#119 didn't merge to master.

[shawnh2]

assign myself now, I will take a deeper look.