Add pool-source flag for DB connections #20
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It would be useful for userland Hack code in Slack to determine whether a connection obtained via an HHVM async_mysql connection pool was recycled from the pool or freshly opened, to allow more granular instrumentation than what pool-level stats currently provide. See facebook/hhvm#8013 for the full rationale.
Add two new connection fields that expose this information. A followup diff will expose these to HHVM/Hack.