Epsilon is a concept used in clustering systems to ensure that a cluster can maintain quorum, which is the minimum number of votes required for the cluster to make decisions and stay operational. Epsilon is automatically assigned to the first node when the cluster is created. It acts as an extra fractional vote to ensure the cluster maintains quorum, especially in cases where there may be an even number of nodes. Therefore, the true statements about epsilon are that it is automatically assigned to the first node when the cluster is created, and it is an extra fractional vote that enables quorum.