I understand that the tune is not "traditional" in the sense of composer unknown, but is attributed to Pipe Major William Robb - 1863 - 1909. See: William Robb

It is the tune that was played by many pipers around the world at 6am (local time wherever they were) on 11th November 2018, on the 100th anniversary of the signing of the Armistice agreement.
It is a fine tune.