Anyone create Device template or custom pollers for Milestone camera ?
I haven't, but it will be the same process as creating any other custom poller.
For that last, then other than the manufacturer or an SNMP Walk, I like and use: https://mibs.observium.org/ and https://mibbrowser.online/mibdb_search.php
if you have SAM, you can monitor them using SAM and creating a template for application and then selecting windows service monitor to monitor Milestone, adding to the Net Service Name: the service of Milestone. Also, maybe this link help you MILESTONESYS-RECORDER-MIB: View SNMP OID List / Download MIBVENDOR: MILESTONE SYSTEMS
You can create a template using SAM, monitoring the Milestone service. Also this link its helpful for all the OID for Milestone (pollers) MILESTONESYS-RECORDER-MIB: View SNMP OID List / Download MIB VENDOR: MILESTONE SYSTEMS
For the Application Monitor use Component type: Windows Service Monitoring to monitoring the Milestone Service. Once the template is created apply that template to your servers (SAM)You can monitoring those servers as Agent or Agentless
Once selected the Component type Windows Service Monitoring, in the space available for Net Service Name, you need to add the Milestone Service you want to monitorits very strait forward, if you already have Milestone installed on that server, the services should be running, the template will run (if agent as Agent-iniciated or Server iniciated communication, Remember to open the port for Agent, refer to SolarWinds system requirement documentation.solarwinds.com/.../core-agent-requirements-sw476.htm Hope this is helpful.