Application Insights has an active ecosystem with our partners developing integrations using our Open Source SDKs and public endpoints. We recently had Lombiq (one of our partners) integrate Application Insights into Orchard CMS and a multi-tenant public SaaS version of the same.
Here is a case study of their experience in their own words, by Zoltán Lehóczky, co-founder of Lombiq, Orchard CMS developer.
We have integrated Application Insights into a multi-tenant service in such a way that each tenant gets its own separate performance and usage monitoring. At the same time, we, the providers of the service, get overall monitoring of the whole platform. The code we wrote is open-source.