Installable OnEdit not being called in Stock spreadsheet

Question

I have a function (in a Google Apps Script), not called onEdit(), but something else and this has been set up to be called from any on edit events via in the Installable onEdit on a Google Spreadsheet.

The spreadsheet is around stocks and monitors a portfolio and the purpose of the function is to send an email as soon as a stop loss is hit on a stock, i.e. the price of a stock falls to a certain price. The price of the stock is retrieved and updated via the Google Finance API in a column in the spreadsheet.

Now, when running the function from the script or locally editing the spreadsheet, the function is called successfully. However, I am finding that as the stock price is updating automatically throughout the day on Google Drive and falling to the stop loss price, the on edit function is not being called. I read somewhere about it not being called by an "anonymous" user? I know it's not being called as I have an "email counter" column, which decreases every time the function is called, and once at 0 no more mails will be sent to avoid spamming. This not decreasing via the Google Finance API automatic price updates. Can someone advise what is causing this and if this there is any workaround?

Answer 1

A list of things-that-don't-trigger-onEdit, along with their issue tracking ids, were provided in a previous answer.

Content of a spreadsheet changed by scripts does not trigger onEdit.

A work-around might be to use a time-based trigger, and in the call-back scan for and react ti changes. (Could the updater set a trigger to fire in the near future, perhaps?) Challenges for this will be around balancing responsiveness vs trigger limits.