SLACK_THREAD_TS not working or needs better documentation

[kishore-vkrn]

Hi,

From README for variable SLACK_THREAD_TS I got

If you want to send message in a thread, you can pass the timestamp of the parent message to this variable. You can get the timestamp of the parent message from the message URL in Slack. (ex: SLACK_THREAD_TS: 1586130833.000100)

But still not clear how would I get the timestamp of the parent mesage. Looking at slack api ts seems a better output but when I tried I get separate messages not in threads

jobs:
  send-slack-notification:
    runs-on: [ Standard, self-hosted, X64, ubuntu ]
    needs: [validate-inputs]
    steps:
      - name: Notify Slack - Deployment Started
        id: slack-notify
        uses: actions/action-slack-notify@v2.2.1
        if: always()
        env:
          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
          SLACK_MESSAGE: "*» ${{ github.event.inputs.env }}* deployment started. _${{ github.event.inputs.tag }}_"
          MSG_MINIMAL: actions url, commit
          SLACK_FOOTER: ""
          SLACK_COLOR: ${{ job.status }} 
          
  ec2-deployment:
    needs: [send-slack-notification]
    runs-on: [ Standard, self-hosted, X64, ubuntu ]
    steps:
      - name: Notify Slack - Deployment status
        uses: actions/action-slack-notify@v2.2.1
        if: always()
        env:
          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
          MSG_MINIMAL: actions url, commit
          SLACK_MESSAGE: "*» ${{ github.event.inputs.env }}*. deployment status  → ${{ job.status }}"
          SLACK_FOOTER: ""
          SLACK_COLOR: ${{ job.status }}
          SLACK_THREAD_TS: "${{ needs.slack-notify.outputs.ts }}"

Better documentation or on how to use this will be appreciated.

[albertoxamin]

Looks like there was a PR that was setting the output_ts but its not in the merged code cc. @L0RD-ZER0
https://github.com/rtCamp/action-slack-notify/pull/73/files#diff-2873f79a86c0d8b3335cd7731b0ecf7dd4301eb19a82ef7a1cba7589b5252261R254-R262

[MishaKav]

any updates? the output for ts maybe very useful.