fix(mixin): Correct invalid queries in alloy logs dashboard

[thampiotr]

PR Description

The logs overview dashboard was not even properly working, had query errors when used with k8s. This adds a simple replacement dashboard of the imported one and fixes the issues with queries.

We are also adding some tests to validate the correctness of dashbaords that we produce.

Notes to the Reviewer

Before:

After:

PR Checklist

• Documentation added
• Tests updated
• Config converters updated

[Copilot]

Pull request overview

This PR fixes invalid queries in the Alloy logs dashboard by replacing the grafonnet-based implementation with a custom dashboard definition. The main issue being addressed is that cluster and namespace template variables were previously querying Loki (using empty label selectors like {}) instead of Prometheus metrics, which caused invalid queries.

Key changes:

• Rewrites the logs dashboard using custom dashboard utilities instead of the logs-lib library
• Fixes template variable queries to use Prometheus datasource for cluster/namespace variables
• Adds comprehensive test suite to validate dashboard configurations and feature flags

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
operations/alloy-mixin/dashboards/alloy-logs.libsonnet	Complete rewrite replacing grafonnet logs-lib with custom implementation; fixes datasource queries for template variables
operations/alloy-mixin/rendered/dashboards/alloy-logs.json	Regenerated dashboard JSON reflecting the corrected queries and new structure
operations/alloy-mixin/test/config_test.jsonnet	New test file validating feature flags, template variables, and filter selector functionality
Makefile	Adds test-mixin target and Grizzly validation to ensure dashboard validity

Comments suppressed due to low confidence (1)

operations/alloy-mixin/test/config_test.jsonnet:1

• The 'includeAll' value for the job variable is inconsistent between K8s and non-K8s configurations. In the K8s configuration (line 51), job has 'includeAll: true', but in the non-K8s configuration (line 107), it has 'includeAll: false'. This inconsistency could cause unexpected behavior when switching between cluster modes. Consider aligning these values to match the intended behavior.

local mixin = import '../mixin.libsonnet';

[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

[dehaansa]

Having some mixin tests is awesome! Code looks good, have not deployed the updated logs dashboard but it looks good in review.