Found it, it's mentioned in the Wiki Page

This verse encrypts the value of pi (π) up to 31 decimal places.

गोपीभाग्यमधुव्रात-शृङ्गिशोदधिसन्धिग॥ खलजीवितखाताव गलहालारसंधर॥

... <Malyalam shloka/poem> This verse directly yields the decimal equivalent of pi divided by 10: pi/10 = 0.31415926535897932384626433832792

This link goes into more details of this one shloka/poem

https://www.speakingtree.in/allslides/encryption-in-ancient-...

Not anything about Krishna. The Sadratnamala:

https://en.m.wikipedia.org/wiki/Sadratnamala

And it was intentional.

Yes, indeed. It is mentioned in the wikipedia link ("गोपीभाग्यमधुव्रात..."). I first read it in the "Vedic Mathematics" book by HH Bharati Krishna Tirtha Swamiji. Since he didn't give any attribution, I suppose he was the first one to reveal it.

Yes that’s right. This is the verse-

गोपीभाग्यमधुव्रात-शृङ्गिशोदधिसन्धिग॥ खलजीवितखाताव गलहालारसंधर॥

Beautiful