Locate example code to page update when data updated (thread view page)

[Earl]

Just like in the thread view page, when someone adds a reply, we can see a small message that new posts have been added.

Where to locate this code?

My add-on has a different page. I need to update that page when some data is received in the database, without the user hitting the refresh button.
Locate example code to page update when data updated (thread view page)

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