When you deploy Microsoft Skype for Business Server 2019 together with a stand-alone Mediation server pool, the following event ID 25075 is logged on the Mediation server:
Log Name: Lync ServerSource: LS Mediation ServerDate: DateTimeEvent ID: 25075Task Category: (1030)Level: WarningKeywords: ClassicUser: N/AComputer: ComputerNameDescription:Mediation Server encountered an invalid setting that has been ignored.Setting: Mediation Server Front End side SipHealthMonitor port not configured. Health monitor is disabled.Reason: N/ACause: Settings configured incorrectly.Resolution:Reconfigure the specified setting.Event Xml:<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"><System><Provider Name="LS Mediation Server" /><EventID Qualifiers="33798">25075</EventID><Level>3</Level><Task>1030</Task><Keywords>0x80000000000000</Keywords><TimeCreated SystemTime="SystemTime" /><EventRecordID>397</EventRecordID><Channel>Lync Server</Channel><Computer>ComputerName</Computer><Security /></System><EventData><Data>Mediation Server Front End side SipHealthMonitor port not configured. Health monitor is disabled.</Data><Data>N/A</Data></EventData></Event>