Alerting: Logs should not be capitalized and the errors key should be "err" (#50333)

* Alerting: decapitalize log lines and use "err" as the key for errors

Found using (logger|log).(Warn|Debug|Info|Error)\([A-Z] and (logger|log).(Warn|Debug|Info|Error)\(.+"error"

pkg/services/ngalert/api/api_ruler.go

@@ -257,7 +257,7 @@ func (srv RulerSrv) RouteGetRulesConfig(c *models.ReqContext) response.Response
 	result := apimodels.NamespaceConfigResponse{}
 
 	if len(namespaceMap) == 0 {
-		srv.log.Debug("User has no access to any namespaces")
+		srv.log.Debug("user has no access to any namespaces")
 		return response.JSON(http.StatusOK, result)
 	}