Скачать или смотреть Resolving Grafana's PromQL Query Merge Issues

Struggling with `PromQL` queries not merging in Grafana? Discover our comprehensive guide to resolve metric merging issues and get your data visualized correctly.
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Resolving Grafana's PromQL Query Merge Issues: A Simple Guide

When working with Grafana and Prometheus, it's not uncommon to encounter issues with displaying multiple metrics in a cohesive manner. One such problem involves the merging of PromQL queries for different metrics. In this guide, we will explore why this happens and provide straightforward steps to resolve it.

The Problem: Metrics Not Merging

Imagine you have two metrics in Prometheus, metric1 and metric2, both of which are counts. You want to display these metrics side by side in Grafana.

Expected vs. Reality

When you set up your query in Grafana, you expect to see a clear table with values from both metrics, similar to this:

[[See Video to Reveal this Text or Code Snippet]]

However, what you'll frequently encounter is something like this:

[[See Video to Reveal this Text or Code Snippet]]

Not only does this look cluttered, but it also causes confusion as Grafana is not automatically merging the values of metric1 and metric2.

The Solution: Merging Your PromQL Queries

To resolve the merging issues with your PromQL queries in Grafana, follow these easy steps:

Steps to Merge Metrics in Grafana

Open the Transform Tab: Once you have your query set, navigate to the "Transform" tab located in your Grafana panel settings.

Add Transformation:

Click on the “Add transformation” button.

This will open a dropdown of available transformations that you can apply to your data.

Choose Outer Join: From the dropdown menu, select the "Outer join" option. This allows you to combine the datasets based on common fields.

Fill in the Field Name: You will need to specify a common field for merging the metrics. In this case, fill in the "Field name" with instance. This instructs Grafana to align the values of metric1 and metric2 based on the instance label.

Conclusion

Following the steps outlined above should resolve the issue of merging PromQL queries in Grafana. Merging your metrics not only makes your dashboards look cleaner but also allows for easier data analysis. So next time you face this problem, remember to transform your queries using the outer join method!

By understanding this method, you can ensure that all your relevant metrics align perfectly and provide the insights you need. Happy graphing!