find recently changed issues / PR's - https://developer.github.com/v4/explorer/

query.graphql

{
  viewer {
    pullRequests(first: 10, orderBy: {field: UPDATED_AT, direction: DESC}) {
      nodes {
        title
        closedAt
        url
      }
    }
    issues(first: 10, orderBy: {field: UPDATED_AT, direction: DESC}) {
      nodes {
        title
        closedAt
        updatedAt
        url
      }
    }
  }
}