Proposal: roll pg_stat_statements into core

Folks,

I'd like to $Subject, on by default, with a switch to turn it off for
those really at the outer edges of performance. Some reasons include:

- It's broadly useful.
- Right now, the barrier for turning it on is quite high. In addition
  to being non-core, which is already a pretty high barrier at a lot
  of organizations, it requires a shared_preload_libraries setting,
  which is pretty close to untenable in a lot of use cases.
- The overhead for most use cases is low compared to the benefit.

Before I go do the patch, I'd like to see whether there's anything
like a consensus as to the what and how of doing this.

What say?

Best,
David.
-- 
David Fetter <david(at)fetter(dot)org> http://fetter.org/
Phone: +1 415 235 3778

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