• Log Insights: Add "invalid input syntax for type json" log event
  • This is a variant of the existing invalid input syntax log event,
    with a few additional details.
• Log Insights: Improve handling of "malformed array literal" log event
  • Add support for a double quote inside the array content
  • Mark the content as a table data log secret
  • Add the known DETAIL line "Unexpected array element"
• Fix incorrect index recorded for unknown parent or foreign key tables
  • Previously we would sometimes use 0 in these situations, which could
    cause errors in snapshot processing
• Heroku: drop Log Insights instructions after log test
  • This was intended to ease onboarding, but it contradicts our in-app
    instructions to wait until real snapshot data comes in to proceed
    with Log Insights setup
• AWS: Cache RDS server IDs and errors to reduce API requests
  • This can help avoid hitting rate limits when monitoring a large number
    of servers
• Fix issue with domains with no constraints