Update README.md (#5941)

README.md

@@ -19,7 +19,7 @@ in Cloud Native architecture.
 The core features are following.
 
 - Service, service instance, endpoint metrics analysis
-- Root cause analysis. Profile the code on the runtime. Read [Apache SkyWalking: Use Profiling to Fix the Blind Spot of Distributed Tracing](https://thenewstack.io/apache-skywalking-use-profiling-to-fix-the-blind-spot-of-distributed-tracing/).
+- Root cause analysis. Profile the code on the runtime
 - Service topology map analysis
 - Service, service instance and endpoint dependency analysis
 - Slow services and endpoints detected
@@ -35,9 +35,9 @@ SkyWalking supports to collect telemetry (traces and metrics) data from multiple
 and multiple formats,
 including
 1. Java, .NET Core, NodeJS, PHP, and Python auto-instrument agents.
-1. Go agent.
+1. Go and C++ SDKs.
 1. LUA agent especially for Nginx, OpenResty.
-1. Service Mesh Observability. Support Istio telemetry metrics. Recommend to use Envoy Access Log Service (ALS) for better performance, first introduced at [KubeCon 2019](https://www.youtube.com/watch?v=tERm39ju9ew).
+1. Service Mesh Observability. Control panel and data panel. 
 1. Metrics system, including Prometheus, OpenTelemetry, Spring Sleuth(Micrometer).
 1. Browser application performance, including metrics and error logs.
 1. Zipkin v1/v2 and Jaeger gRPC format with limited topology and metrics analysis.(Experimental).
@@ -48,7 +48,8 @@ for better performance. Read [the paper of STAM](https://wu-sheng.github.io/STAM
 # Documentation
 - [Official documentation](https://skywalking.apache.org/docs/)
 - [The paper of STAM](https://wu-sheng.github.io/STAM/), Streaming Topology Analysis Method.
-- [Blog](https://skywalking.apache.org/blog/2020-04-13-apache-skywalking-profiling/) about profiling the code performance in production.
+- [Blog](https://skywalking.apache.org/blog/2020-04-13-apache-skywalking-profiling/) about Use Profiling to Fix the Blind Spot of Distributed Tracing
+- [Blog](https://skywalking.apache.org/blog/2020-12-03-obs-service-mesh-with-sw-and-als/) about observing Istio + Envoy service mesh with ALS solution.
 
 NOTICE, SkyWalking 8.0+ uses [v3 protocols](docs/en/protocols/README.md). They are incompatible with previous releases.