Two years ago I installed the Gmail Meter on my G-mail account. It provides me reports monthly. Since I'm not aware about managing the triggers and this stuff, I have no idea how and where I could stop or cancel that trigger. Can you give me a clue?
You can see all your triggers by opening up the script editor. Do you have any Apps Script files in your Drive?
Google Drive
If you do, open up an Apps Script, and in the script editor, choose the RESOURCES menu, and the ALL YOUR TRIGGERS menu item. You can review, and delete all your triggers there.
The Gmail Meter documentation states that you received an email when you signed up, and that email has a link to uninstall the app. Did you go through that process?
Also, go into your Google Account,
Link To Google Settings Page
and view all your connected apps.

Revoke Access to any App that you don't want any more.
Also go into your security checkup:

and remove anything that you don't want anymore.
The Gmail Meter documentation also states:
Lastly, simply delete the file in your Google Docs/Drive that is used for storing the Gmail Meter data: "Gmail Meter Data - Do not delete".
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