Catch exceptions and restart
Track table/index size
Add simple tests for table/index sizes
Merge branch 'master' into alq/pg-locks
After a round of fairly cosmetic pylint
bgwriter metrics are monotonic counters
Restart postgres check on dropped connections
Roll up all singular PG metrics into the same query framework
Drop brittle tests
Merge pull request #1105 from DataDog/alq/pg-locks

PG check updates (connection, sizes, bgwriter)