Skype for Business Server 2019 P2P VideoInteropServer SipTrunk Audio Video Watcher is an instance of Synthetic Transactions that are running against all the VideoInteropServer Pools.
<ClassType ID="Microsoft.LS.2019.PoolWatcher.P2PVideoInteropServerSipTrunkAV" Accessibility="Public" Abstract="false" Base="System!System.Entity" Hosted="true" Singleton="false" Extension="false"/>