Book Image

Mastering Go – Third Edition - Third Edition

By : Mihalis Tsoukalos
5 (2)
Book Image

Mastering Go – Third Edition - Third Edition

5 (2)
By: Mihalis Tsoukalos

Overview of this book

Mastering Go is the essential guide to putting Go to work on real production systems. This freshly updated third edition includes topics like creating RESTful servers and clients, understanding Go generics, and developing gRPC servers and clients. Mastering Go was written for programmers who want to explore the capabilities of Go in practice. As you work your way through the chapters, you’ll gain confidence and a deep understanding of advanced Go concepts, including concurrency and the operation of the Go Garbage Collector, using Go with Docker, writing powerful command-line utilities, working with JavaScript Object Notation (JSON) data, and interacting with databases. You’ll also improve your understanding of Go internals to optimize Go code and use data types and data structures in new and unexpected ways. This essential Go programming book will also take you through the nuances and idioms of Go with exercises and resources to fully embed your newly acquired knowledge. With the help of Mastering Go, you’ll become an expert Go programmer by building Go systems and implementing advanced Go techniques in your projects.
Table of Contents (17 chapters)
14
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15
Index

Exposing metrics to Prometheus

Imagine that you have an application that writes files to disk and you want to get metrics for that application to better understand how the writing of multiple files has an effect on the general performance—you need to gather performance data for understanding the behavior of your application. Although the presented application uses the gauge type of metric only because it is what is appropriate for the information that is sent to Prometheus, Prometheus accepts many types of data. The list of supported data types for metrics is the following:

  • Counter: This is a cumulative value that is used for representing increasing counters—the value of a counter can stay the same, go up, or be reset to zero but cannot decrease. Counters are usually used for representing cumulative values such as the number of requests served so far, the total number of errors, etc.
  • Gauge: This is a single numerical value that is allowed to increase...