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WatchDog
WatchDog is a Realtime Message, Event, HTTP (Request & Response) and Exception logger and viewer for ASP.Net Core Web Apps and APIs. It allows developers log and view messages, events, http requests made to their web application and also exception caught during runtime in their web applications, all in Realtime. (by IzyPro)
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
You might want to checkout WatchDog.NET on the nuget store. You might not need to write your own middleware afterall. Here's the documentation https://github.com/IzyPro/WatchDog
NOTE:
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Hence, a higher number means a more popular project.