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The Ultimate Guide to gRPC in ASP.NET Core

Using Metrics in a gRPC Application

Explore how to implement and use metrics in gRPC applications on ASP.NET Core. Learn to emit, collect, and publish key data like call counts and durations using Prometheus middleware to monitor application health and performance effectively.

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Metrics allow us to monitor the health of the application and detect various trends in its usage. Metrics are similar to logging. However, while logging is responsible for producing relatively detailed human-readable messages, metrics represent relatively simple data, such as counters and durations. This data can then be visualized on a time-series graph, such as the one below.

Metrics visualization example
Metrics visualization example

With gRPC in particular, here are some examples of the metrics we can collect:

  • The number of successful gRPC calls

  • The number of failed gRPC calls

  • Call durations

  • The counts of ...