SNOW-926008 supportability/observability enhancement for generic and proxy use-cases #699
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generic observability: instead of swallowing the underlying error upon connectivity issue and emit a hard-to-debug generic error message, log that underlying error stack on DEBUG loglevel
proxy: detecting if HTTP_PROXY/HTTPS_PROXY environmental variable is set, log them on DEBUG loglevel
proxy: added logging for Connection's proxyPort and proxyUser (if set), had only proxyHost.
-- this bit of logging now moved to generic agent
proxy: if both HTTPS_PROXY and proxyHost is set, can lead to not-so-trivial-to-debug situations ; log this on WARN loglevel for more intuitive troubleshooting