How deeply does Learn Docker in a Month of Lunches, Second Edition cover Prometheus client library?

Explains automatic runtime collection, custom metric updates, and endpoint verification without detailing the full client-library API.

Prometheus client library

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

A Prometheus client library is a language-specific software library that records application metrics and exposes them in a format Prometheus can collect.

A Prometheus client library records application metrics and exposes an HTTP endpoint that Prometheus can collect. Language-specific clients also export useful runtime data automatically. section 9.2

A client library can expose:

Runtime-level metrics, such as active Go goroutines or Java virtual-machine memory usage. section 9.2

Inspecting application metrics

Start the image gallery stack with Docker Compose, use the application, and browse to its /metrics endpoint. Generate several requests, then inspect the endpoint again to see custom and runtime values.

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

Cover of Learn Docker in a Month of Lunches, Second Edition

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Related concepts

metricused by · A metric is a quantitative measure used to characterize or assess a property, condition, behavior, performance, or outcome.
Prometheususes · Prometheus is an open-source monitoring and alerting system that collects, stores, and queries time-series metrics.
instrumentationuses · Instrumentation is the addition or activation of mechanisms in software or systems to observe, measure, or record their behavior during execution.
JavaScript runtimeuses · A JavaScript runtime is an execution environment that runs JavaScript code and provides the language engine and host APIs needed to interact with its platform.

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.