For confirmed bugs, please report:

• Version: 6.6.2
• Operating System: Windows
• Discuss Forum URL: https://discuss.elastic.co/t/enabling-postgresql-module-in-metricbeat-causes-crash/173467
• Steps to Reproduce:

# Run under Windows
$ metricbeat modules enable postgresql
$ vim modules.d/postgresql.yml
 > set period to 3s

This causes an inordinate amount of open connections to PostgreSQL server, all of them in the ESTABLISHED state. Windows becomes unusable / SQL server crashes due to OOM.

Under macOS, the metricbeat process peaks around 1200 open sockets, most of them in the CLOSE_WAIT state. Under Windows, those are shown as ESTABLISHED and don't seem to clean up after Metricbeat is killed (Sysinternals tcpview becomes sluggish).

This bug may be related:
golang/go#6593

Tried SetMaxOpenConns / sharing a single DB object between filesets, but made no difference.