How to Add Observability to ASP.NET Core APIs with Prometheus and Grafana

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A hands-on tutorial demonstrates how to implement observability in an ASP.NET Core Minimal API using Prometheus, Grafana, and Docker Compose. Developers learn to create custom metrics — including Counters and Histograms — via the prometheus-net.AspNetCore package, exposing data through a /metrics endpoint. Prometheus periodically scrapes this endpoint and stores time-series data, which Grafana then visualizes through configurable dashboards built with PromQL queries. The guide covers practical steps such as configuring Prometheus as a Grafana data source, using Docker Compose service names instead of localhost, and importing pre-built dashboards from Grafana Labs. The tutorial is aimed at teams monitoring APIs, microservices, and distributed ASP.NET Core systems that need to track request volume and operation duration over time.

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