What are canary transformations?

Canary transformations are logic blocks, typically written in CEL or JavaScript, that process the raw output of a health check into structured, actionable results or new checks.

What is a fan-out transform?

A fan-out transform takes a single source of data, such as a list of database instances or alerts, and generates a separate check result for each item in that list.

Why does this skill prefer CEL over JavaScript?

Common Expression Language (CEL) is preferred for its consistency, security, and easier review process within YAML-based infrastructure configurations, though JS is supported for complex logic.

Can I use previous check results in a transformation?

Yes, this skill provides stateful patterns using the last_result() function to access context from previous runs, which is ideal for cursors and time-windowed checks.

Mission Control Canary Transformations

Name: Mission Control Canary Transformations
Author: flanksource

byflanksource

0•

Analytics & Monitoring

Generates production-ready transformation blocks for Mission Control canary checks to handle fan-out, inline modifications, and resource discovery.

The Write Canary Transformations skill provides specialized guidance for authoring robust 'transform' blocks within Flanksource Mission Control canary checks. It streamlines the process of converting raw check data into actionable results by supporting three primary patterns: fan-out (splitting one check into many), inline (modifying current results), and canary generation (creating new checks from discovered resources). By enforcing best practices like Common Expression Language (CEL) consistency, deterministic naming, and explicit lifecycle management, this skill ensures that your observability-as-code is reliable, maintainable, and highly performant.

Key Features

010 GitHub stars

02Standardized output contracts for structured detail payloads and custom metrics.

03Stateful transformation patterns using last_result() for time-series data.

04Automated lifecycle controls including deletedAt and transformDeleteStrategy.

05Support for complex fan-out patterns to map response items to individual checks.

06Expert generation of CEL, JavaScript, and template-based transform blocks.

Use Cases

01Generating dynamic HTTP canaries based on Kubernetes ingress resources discovered during a check.

02Transforming a Prometheus alert manager response into individual, labeled check results.

03Normalizing disparate API responses into a unified health status with custom duration and pass/fail logic.

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add flanksource/claude-code-plugin write-canary-transformations

For use in Claude.ai and ChatGPT

Download Skill