This meter is characterized by alternating lines of iambic tetrameter (four metrical feet, each consisting of an unstressed syllable followed by a stressed syllable) and iambic trimeter (three metrical feet).
Here's a breakdown of the first two lines:
* It was not Death, for I stood up
* And all the folks I knew were there
This pattern continues throughout the poem, creating a rhythmic and conversational tone that is typical of ballads.