vmagent: properly handle unexpected EOF

[dmitryk-dk]

Is your feature request related to a problem? Please describe

When the client closes the connection, vmagent creates a log message with warning severity. See the example below:

cannot read block of data: unexpected EOF

This warning message produces an alert to which the user cannot handle.

Describe the solution you'd like

We can handle unexpected EOF errors like it was done for the vmalert component
https://github.com/VictoriaMetrics/VictoriaMetrics/pull/4146/files

This will prevent producing and firing an alert that which user cannot handle

Describe alternatives you've considered

No response

Additional information

No response

[hagen1778]

The fix was merged here b7d07e5 and will be available in the next release.

[valyala]

Starting from v1.94.0, vmagent shouldn't emit unexpected EOF error logs when the remote side unexpectedly closes connection. Closing this issue as done.