protected String getTypeAsString() {
    String type = null;
    if (isNonRedundant()) {
      type = "NON_REDUNDANT";
    } else if (isRedundant()) {
      type = "REDUNDANT";
    } else {
      type = "PRIMARY";
    }
    return type;
  }
returns the time between server-to-client ping messages on idle subscription connections
geode-core/src/main/java/org/apache/geode/internal/cache/tier/sockets/ServerQueueStatus.java