Checkmk Werk 13168: mk_postgres: fix for CentOS 8: "MAIN": not running

ID: 13168 Title: mk_postgres: fix for CentOS 8: "MAIN": not running Component: Checks & agents Level: 1 Class: Bug fix Version: 2.1.0i1 The path for postgres instance "main" is called "data" and not "main" on some platforms. That could lead to the following error message: instance "MAIN": not running In order to support more platforms the instance detection for "main" will additionally fallback to find "data" in the path if "main" was not found. The agent must be redeployed in order to apply this bugfix.