• Added HTTP client metric that measures the response duration (time until response content reading is finished).
• Added "client" label containing the name of HTTP client to HTTP client metrics.
• Added "code" label with HTTP response code to HTTP client metrics. #299
• HTTP client metrics now count responses when they are completed, not when started, to match with HTTP server metrics. Also renamed metric to httpclient_requests_sent_total since it said "received" previously (due to copy-paste error from HTTP server metrics).
• HTTP client metrics are now published via the netstandard package, without requiring ASP.NET Core. #314
• Added Counter.IncTo[Current]TimeUtc().