v0.39.0

• Docker: Use Docker's USER command to set user, to support running as non-root
  • This enables the collector container to run in environments that require the
    whole container to run as a non-root user, which previously was not the case.
  • For compatibility reasons the container can still be run as root explicitly,
    in which case the setpriv command is used to drop privileges. setpriv replaces
    gosu since its available for installation in most distributions directly, and
    fulfills the same purpose here.
• Selfhosted: Support running log discovery with non-localhost db_host settings
  • Previously this was prevented by a fixed check against localhost/127.0.0.1,
    but sometimes one wants to refer to the local server by a non-local IP address
• AWS: Add support for AssumeRoleWithWebIdentity
  • This is useful when running the collector inside EKS in order to access
    AWS resources, as recommended by AWS: https://docs.aws.amazon.com/eks/latest/userguide/specify-service-account-role.html
• Statement stats retrieval: Get all rows first, before fingerprinting queries
  • This avoids showing a bogus ClientWrite event on the Postgres server side whilst
    the collector is running the fingerprint method. There is a trade-off here,
    because we now need to retrieve all statement texts (for the full snapshot) before
    doing the fingerprint, leading to a slight increase in memory usage. Nonetheless,
    this improves debuggability, and avoids bogus statement timeout issues.
• Track additional meta information about guided setup failures
• Fix reporting of replication statistics for more than 1 follower