Is Chant of Metta from Tipitaka?

I came across 'The Chant of Metta' (*Metta Gatha*), in a beautiful rendition by Imee Ooi in this YouTube video . Here is the full text in Pali, with English translation: [THE CHANT OF METTA](http://satipatthana.ca/articles/06the_chant_metta.pdf) Is this chant from the Tipitaka or is it a later composition? The Karaniya Metta Sutta from Tipitaka has different wordings in this translation.