add action for sending custom metrics

send-custom-metrics/README.md

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+## Description
+
+Sends custom metrics to a specified metrics endpoint. This action makes a POST request using a bearer token for authorization.
+
+## Inputs
+
+| parameter           | description                                               | required | default |
+|---|---|---|---
+| METRICS_ENDPOINT_URL| The metrics endpoint URL where the data will be sent.     | `true`   |         |
+| BEARER_TOKEN        | The authorization token for the endpoint.                 | `true`   |         |
+| data                | The metric data to send, formatted as required by the endpoint. | `true`  |         |
+
+### Example Usage
+
+Replace `METRICS_ENDPOINT_URL` and `BEARER_TOKEN` with your actual metrics endpoint URL and bearer token, which should be stored as secrets in your GitHub repository.
+
+```
+jobs:
+  send-metrics:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Send Custom Metrics
+      uses: your-username/send-custom-metrics-action@main
+      with:
+        METRICS_ENDPOINT_URL: ${{ secrets.METRICS_ENDPOINT_URL }}
+        BEARER_TOKEN: ${{ secrets.BEARER_TOKEN }}
+        data: 'your_metric{label="value"} 123'
+```

send-custom-metrics/action.yaml

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+name: Send Custom Metrics
+description: Sends custom metrics to an endpoint
+
+inputs:
+  METRICS_ENDPOINT_URL:
+    description: The metrics endpoint URL
+    required: true
+  BEARER_TOKEN:
+    description: The authorization token for the endpoint
+    required: true
+  data:
+    description: The metric data to send
+    required: true
+
+runs:
+  using: composite
+  steps:
+    - name: Send Metric
+      shell: bash
+      run: |
+        curl -H "Authorization: Bearer ${{ inputs.BEARER_TOKEN }}" \
+             -X POST "${{ inputs.METRICS_ENDPOINT_URL }}" \
+             -d '${{ inputs.data }}'