Metric endpoint

As explained in Learn Docker in a Month of Lunches, Second Edition

A metrics endpoint is an interface that exposes the current measurements of a system or application in a machine-readable format.

A metric endpoint exposes an application's or system's current measurements in a machine-readable format. A monitoring tool such as Prometheus periodically pulls the endpoint, stores values with timestamps, and makes them available for inspection. section 9.1

Use a metric endpoint to connect an application or platform to monitoring:

• Configure the Docker Engine or application to expose metrics at a reachable endpoint such as /metrics. section 9.1
• Configure Prometheus to scrape the endpoint on a schedule and verify the target is healthy. section 9.1
• Filter collected measurements or graph them in the Prometheus web UI. section 9.1

Application monitoring lab

Run the instrumented to-do list application, browse to its /metrics URL, and connect it to Prometheus and Grafana. A useful dashboard shows tasks created, total HTTP requests processed, and requests currently being processed. section 9.6

Prometheus has a simple web UI that you can use to find metrics and run queries.

Use the Prometheus interface to find collected metrics and run queries against them. section 9.1

How Learn Docker in a Month of Lunches, Second Edition covers it

How deep it goes

Explains endpoint configuration, scraping, target verification, and querying, but does not require source-code changes.

Examples

Uses Docker's /metrics endpoint, an application's /metrics URL, Prometheus queries, and a to-do list dashboard.

What it assumes

Assumes basic Docker usage while teaching endpoint discovery, Prometheus scraping, and dashboard wiring through runnable exercises.

What you can do after

Operate Prometheus and Grafana to collect, inspect, query, and dashboard application or infrastructure measurements.

How it connects

Ties metric endpoints to Prometheus, Grafana, Docker Engine, Docker Compose, and observability.

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Also explained in

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  Spring AI in ActionA metrics endpoint is an HTTP endpoint that exposes named application measurements and their associated statistics and tags.

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Related concepts

• Prometheusused by · Prometheus is an open-source monitoring and alerting system that collects, stores, and queries time-series metrics.
• Spring Boot Actuatorused by · Spring Boot Actuator is a Spring Boot module that provides production-oriented monitoring, management, operational, and application-metric endpoints.
• application propertiesconfigured by · Application properties are named configuration settings that provide values used to configure an application's behavior.
• HTTP GETuses · HTTP GET is a request method for retrieving a representation of a resource identified by the request target, without requesting a state change.
• Actuator endpointkind of · An Actuator endpoint is a Spring Boot Actuator management interface that exposes operational data or operations through supported communication mechanisms.
• Spring Boot Adminused by · Spring Boot Admin is a web application for monitoring and managing Spring Boot applications through their Actuator endpoints.

This explainer was generated by Manning's knowledge graph from the text of Learn Docker in a Month of Lunches, Second Edition. The section links point to the parts of the book it draws on.