Found at a chameleon which the host failed in Repair-Failed state, i.e. issue 669741.

The chromeos9-audiobox3-host1-chameleon has >1000 ssh connections from the shard 172.25.90.3 (the host name is chromeos-server13.cbf.corp.google.com).

$ ssh root@chromeos9-audiobox3-host1-chameleon
root@socfpga:~# netstat -na | less
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       
tcp        0      0 0.0.0.0:111             0.0.0.0:*               LISTEN      
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      
tcp        0      0 0.0.0.0:9994            0.0.0.0:*               LISTEN      
tcp        0      0 100.115.96.241:22       172.25.90.3:56318       ESTABLISHED 
tcp        0      0 100.115.96.241:22       172.25.90.3:59781       ESTABLISHED 
tcp        0      0 100.115.96.241:22       172.25.90.3:38359       ESTABLISHED 
tcp        0      0 100.115.96.241:22       172.25.90.3:34398       ESTABLISHED 
tcp        0      0 100.115.96.241:22       172.25.90.3:36380       ESTABLISHED 
tcp        0      0 100.115.96.241:22       172.25.90.3:58014       ESTABLISHED 
tcp        0      0 100.115.96.241:22       172.25.90.3:35915       ESTABLISHED 
tcp        0      0 100.115.96.241:22       172.25.90.3:33102       ESTABLISHED 
tcp        0      0 100.115.96.241:22       172.25.90.3:38557       ESTABLISHED 
tcp        0      0 100.115.96.241:22       172.25.90.3:45022       ESTABLISHED 
tcp        0      0 100.115.96.241:22       172.25.90.3:41439       ESTABLISHED 
tcp        0      0 100.115.96.241:22       172.25.90.3:55403       ESTABLISHED 
tcp        0      0 100.115.96.241:22       172.25.90.3:46182       ESTABLISHED 
tcp        0      0 100.115.96.241:22       172.25.90.3:50637       ESTABLISHED 
tcp        0      0 100.115.96.241:22       172.25.90.3:55637       ESTABLISHED 
tcp        0      0 100.115.96.241:22       172.25.90.3:56786       ESTABLISHED 
tcp        0      0 100.115.96.241:22       172.25.90.3:53886       ESTABLISHED 
tcp        0      0 100.115.96.241:22       172.25.90.3:47371       ESTABLISHED 
tcp        0      0 100.115.96.241:22       172.25.90.3:51660       ESTABLISHED 
tcp        0      0 100.115.96.241:22       172.25.90.3:56675       ESTABLISHED 
tcp        0      0 100.115.96.241:22       172.25.90.3:1208        ESTABLISHED 
tcp        0      0 100.115.96.241:22       172.25.90.3:56562       ESTABLISHED 
tcp        0      0 100.115.96.241:22       172.25.90.3:51274       ESTABLISHED 
tcp        0      0 100.115.96.241:22       172.25.90.3:43376       ESTABLISHED 
tcp        0      0 100.115.96.241:22       172.25.90.3:46795       ESTABLISHED 
tcp        0      0 100.115.96.241:22       172.25.90.3:52208       ESTABLISHED 
tcp        0      0 100.115.96.241:22       172.25.90.3:48907       ESTABLISHED 
... (>1000 similar lines)

Probably they are the ssh tunnel connections that haven't been terminated gracefully.