Fix a wrong config and update the youtube video. (#4899)

README.md

@@ -62,7 +62,7 @@ Host in Beijing. Go to [demo](http://122.112.182.72:8080).
 
 **Video on youtube.com**
 
-[![RocketBot UI](http://img.youtube.com/vi/JC-Anlshqx8/0.jpg)](http://www.youtube.com/watch?v=JC-Anlshqx8)
+[![RocketBot UI](http://img.youtube.com/vi/mfKaToAKl7k/0.jpg)](http://www.youtube.com/watch?v=mfKaToAKl7k)
 
 
 # Screenshot

docs/en/ui/README.md

@@ -2,6 +2,10 @@
 SkyWalking official UI provides the default and powerful visualization capabilities for SkyWalking observing distributed
 cluster.
 
+The latest introduction video could be found on the Youtube
+
+[![RocketBot UI](http://img.youtube.com/vi/mfKaToAKl7k/0.jpg)](http://www.youtube.com/watch?v=mfKaToAKl7k)
+
 SkyWalking dashboard includes the following part.
 
 <img src="http://skywalking.apache.org/ui-doc/7.0.0/dashboard.png"/>
@@ -86,8 +90,3 @@ have been highlighted.
 ## Alarm
 Alarm page lists all triggered alarm. Read the backend setup documentation to know how to set up the alarm rule or integrate
 with 3rd party system.
-
-## Metric Comparison
-Metric Comparison is an performance analysis tool. It provides the metrics comparison between different entities or different
-metrics without the dashboard visualization limits. If you suspect any relation performance impact, could use this tool
-to find out whether the metrics pattern matched.

oap-server/server-bootstrap/src/main/resources/ui-initialized-templates.yml

@@ -289,7 +289,7 @@ templates:
                   "entityType": "ServiceInstance",
                   "independentSelector": false,
                   "metricType": "REGULAR_VALUE",
-                  "metricName": "service_instance_resp_time",
+                  "metricName": "service_instance_sla",
                   "queryMetricType": "readMetricsValues",
                   "chartType": "ChartLine",
                   "unit": "%",