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GitHub Repository Dispatch

Run long builds when emissions drop below a certain threshold.

This sample demonstrates how to use the GitHub Repository Dispatch trigger with a Logic App triggered by Azure Monitor Metrics when the CO2 emissions in the choses region drop below a certain threshold.

GitHub repository dispatch Logic App

Use Case

The use case for this sample is to run long builds when the CO2 emissions in the chosen region drop below a certain threshold. This is useful if you want to run builds that are not time critical when the emissions are low.

The sample uses the carbon-appinsights project to send CO2 emissions metrics to Azure Application Insights. The Logic App is triggered by a metric alert on the co2e metric. The Logic App then checks if the emissions are below a certain threshold and if so, it triggers a GitHub Repository Dispatch event to run a GitHub Action workflow.

The sample uses the following Azure resources:

  • Azure Monitor Metric Alert
  • Azure Logic App
  • Azure Logic App Connector for GitHub

Prerequisites

Deployment

The sample can be deployed using the Azure CLI. The following command will deploy the sample. Set up the parameters as described in the main.parameters.json as required for your github environment.

az deployment sub create \
  --location westeurope \
  --template-file main.bicep \
  --parameters @main.parameters.json

After the deployment has completed, you need to configure the Logic App to authenticate with GitHub. To do this, open the Logic App in the Azure Portal and click on the GitHub connector. Then click on Edit API connection and follow the instructions to authenticate with GitHub.

see the .github/workflows/qa-psrule.yml workflow for an example of how to trigger a GitHub Action workflow from a GitHub Repository Dispatch event for this sample.