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https://issues.apache.org/jira/browse/TS-3411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14343988#comment-14343988
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Susan Hinrichs commented on TS-3411:
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The total number of connections ever opened.  
proxy.process.net.connections_currently_open already tracks the number 
connections currently opened.

I'm ok with dropping the successful.  I only care about the successful case.  I 
was following the pattern from proxy.process.socks

proxy.process.socks.connections_successful 0
proxy.process.socks.connections_unsuccessful 0
proxy.process.socks.connections_currently_open 0


> Add stat to track total number of network connections
> -----------------------------------------------------
>
>                 Key: TS-3411
>                 URL: https://issues.apache.org/jira/browse/TS-3411
>             Project: Traffic Server
>          Issue Type: Bug
>          Components: Network, Performance
>            Reporter: Susan Hinrichs
>            Assignee: Susan Hinrichs
>
> Currently, we can use proxy.process.http.total_client_connections or 
> proxy.process.http.total_incoming_connections to determine the number of TCP 
> connections that have been made from the user_agent to ATS, assuming that 
> HTTP/1.0 or HTTP/1.1 are used.
> If SPDY or HTTP/2 are used, these counters will be incremented for each 
> stream not for each network connection.
> It would be useful to add counters in the iocore/net area to directly track 
> the number of TCP connections that have been open over time.  Right now only 
> the number of currently_open connections are tracked via 
> proxy.process.net.connections_currently_open.
> I propose adding two new metrics proxy.process.net.connections_successful_in 
> and proxy.process.net.connections_successful_out



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