int outbufstart; /* index of first meaningful byte in output buffer */
int outbuflen; /* number of meaningful bytes in output buffer */
int outbufsize; /* number of bytes allocated to output buffer */
+ struct event outev; /* events on this metadata connection */
time_t last_ping_time; /* last time we saw some activity from the other end or pinged them */
time_t last_flushed_time; /* last time buffer was empty. Only meaningful if outbuflen > 0 */