$ heroku pg:diagnose
RED: Hit Rate
Name Ratio
────────────────────── ──────────────────
overall index hit rate 0.9312301371392918
overall cache hit rate 0.6370916924495102
GREEN: Connection Count
GREEN: Long Queries
GREEN: Idle in Transaction
GREEN: Indexes
GREEN: Bloat
GREEN: Blocking Queries
GREEN: Sequences
SKIPPED: Load
Error Load check not supported on this plan