add action for sending custom metrics

send-custom-metrics/README.md

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+## Description
+
+Sends custom metrics to an endpoint
+
+## Inputs
+
+| parameter | description | required | default |
+| --- | --- | --- | --- |
+| METRICS_ENDPOINT_URL | The metrics endpoint URL | `true` |  |
+| BEARER_TOKEN | The authorization token for the endpoint | `true` |  |
+| data | The metric data to send | `true` |  |
+
+
+## Runs
+
+This action is a `composite` action.
+
+

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: Validate Metrics Data
+      shell: bash
+      env:
+        METRICS_DATA: ${{ inputs.data }}
+      run: |
+        if ! [[ "$METRICS_DATA" =~ ^[a-zA-Z_:][a-zA-Z0-9_:]*\{?.*\}? [0-9]+ ]]; then
+          echo "The provided metric data does not match the expected Prometheus format."
+          exit 1
+        fi
+        echo "Metric data is valid."
+
+    - name: Send Metric
+      shell: bash
+      run: |
+        curl -H "Authorization: Bearer ${{ inputs.BEARER_TOKEN }}" \
+             -X POST "${{ inputs.METRICS_ENDPOINT_URL }}" \
+             -d '${{ inputs.data }}'