Add postcall related metrics

[kekansalCisco]

Description

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Motivation

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Changes Made

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Related Issues

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Checklist

• I have tested my changes thoroughly and they work as expected.
• I have updated the documentation in the accompanying README.md, if applicable.
• My code follows the project's code style and conventions including the README.md template.
• There is an accompanying Vidcast in the README.md that shows how the project is bootstrapped and run, including a quick demo.
• I have reviewed my changes for any potential security vulnerabilities (packages are updated to the latest versions).

Additional Notes

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Contributor License Agreement

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