If you want to have that as another metric this should be quite easy.

I have just merged a PR to add metrics for timestamps of created, updated and started workflows. You should see this within the latest container tag in a few minutes.

Thanks for added new enhancement(workflow trigger date and time), I have configured below details in my docker-compose.yml file and added latest docker image as per your comments.
But unable to see these metrics(github_workflow_started_timestamp,
github_workflow_updated_timestamp) on latest docker image. Even workflow related metrics also not visible.
If I use promhippie/github-exporter:2.4.0 docker image I'm able to get workflow metrics but recent added metrics not getting.

Could you please help me on this. Below are the environment variables which I'm using latest docker image.

image: promhippie/github-exporter:latest
environment:
  - GITHUB_EXPORTER_TOKEN=github token
  - GITHUB_EXPORTER_REQUEST_TIMEOUT=5m
  - GITHUB_EXPORTER_PER_PAGE=5000
  - GITHUB_EXPORTER_LOG_LEVEL=debug
  - GITHUB_EXPORTER_LOG_PRETTY=true
  - GITHUB_EXPORTER_REPO= organization/repo name
  - GITHUB_EXPORTER_COLLECTOR_WORKFLOWS=true
  - GITHUB_EXPORTER_WORKFLOWS_WINDOW=24h0m0s

As stated within the docs the workflow metrics require a github webhook which got to access the exporter on a single endpoint. This have been introduced with 3.0.0 to avoid all the issues that came up with the pull approach used prior 3.0.0. For local testing you could use a tool like ngrok as a target of the github webhook.

After enabling the webhook you should receive data from GitHub for every build.

Thank you @tboerger, As you suggested above comments, I have tried that like docker image 3.0.0 version but still unable to get new enhancement changes. even tried ngrok and github webhook approach also but no luck.

I have referred this article: https://promhippie.github.io/github_exporter

Could you pls help me on this issue.

Please share the information what you are doing now. What has changed? You created the webhook and you are sending it via ngrok to the exporter. What else have you done, how have you configured the exporter?

I have released a new version, you can see the changes at https://github.com/promhippie/github_exporter/releases/tag/v3.1.0