private void appendStatus(final StringBuilder sb, final ClusterLockKey clusterLockKey, final Lock lock,
                              final Boolean success) {
        if (clusterLockKey != null) {
            sb.append(" key=(");
            clusterLockKey.append(sb);
            sb.append(")");
        }
        if (lock != null) {
            sb.append(" lock=(");
            lock.append(sb);
            sb.append(")");
        }
        if (success != null) {
            sb.append(" success=");
            sb.append(success);
        }
    }
Every 10 minutes try and unlock/remove any locks that we hold that have
not been refreshed by their owner for 10 minutes.
stroom-cluster/stroom-cluster-lock-impl-db/src/main/java/stroom/cluster/lock/impl/db/ClusterLockClusterHandler.java