Git commit information can include the email of the commit author, so you could email them (assuming you already have a email server setup). If the commit author name matches their name on the company messaging tool you could use the messaging tool API to send them a message. If you're using a site like github you can use the github API to post a message on their PR.
almenon2144835
Site Reliability Engineer
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Tableau on Kubernetes: How not to design a Kubernetes offering | by Almenon | Medium (medium.com)
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GitHub - Almenon/AREPL-vscode: program python in real-time (github.com)
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