Release notes for Grafana 7.3.5

Features and enhancements

• Alerting: Improve Prometheus Alert Rule error message. #29390, @wbrowne

Bug fixes

• Alerting: Fix alarm message formatting in Dingding. #29482, @tomowang
• AzureMonitor: Fix unit translation for MilliSeconds. #29399, @secustor
• Instrumentation: Fix bug with invalid handler label value for HTTP request metrics. #29529, @bergquist
• Prometheus: Fixes problem where changing display name in Field tab had no effect. #29441, @zoltanbedi
• Tracing: Fixed issue showing more than 300 spans. #29377, @zoltanbedi