I was troubleshooting an issue at work the other day regarding some PostgreSQL connections that were not closing. They were left IDLE, never closed, and eventually used up all of the possible connections (which totaled 100) configured in the  postgresql.conf configuration file. In the process of troubleshooting I noticed a bunch of Postgres log entries that I was unable to immediately pin down to what was causing the entries. Below I describe the view of the idle Postgres connections, the PostgreSQL log entries that were unfamiliar, and the cause of both.

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