Merge branch '6.0' of https://github.com/apache/incubator-skywalking into 6.0

README.md

@@ -31,6 +31,10 @@ The core features are following.
 
 <img src="https://skywalkingtest.github.io/page-resources/6_overview.png"/>
 
+SkyWalking supports to collect telemetry (traces and metrics) data from different sources, 
+in order to provide more options
+for different scenarios. For better understanding, read our documents.
+
 
 # Document
 - [Documents in English](docs/README.md)

docs/en/concepts-and-designs/README.md

@@ -2,7 +2,7 @@
 Concepts and Designs help you to learn and understand the SkyWalking and the landscape.
 
 - What is SkyWalking?
-  - [Overview and Core concepts](overview.md). Provides a high-level description and introduction, including the problems it solves.
+  - [Overview and Core concepts](overview.md). Provides a high-level description and introduction, including the problems the project solves.
   - [Project Goals](project-goals.md). Provides the goals, which SkyWalking is trying to focus and provide features about them.
 
 After you read the above documents, you should understand the SkyWalking basic goals. Now, you can choose which following parts 
@@ -19,7 +19,5 @@ SkyWalking already support.
   - [Overview](backend-overview.md). Provides a high level introduction about the OAP backend.
   - [Observability Analysis Language](oal.md). Introduces the core languages, which is designed for aggregation behaviour definition.
   - [Query in OAP](query-oap.md). Introduces how to query data from backend, whether a simple metric data or topology map, even trace or log.
-  - [Receiver for other tracers](trace-receiver.md). Helps you to know the purposes of receiving other libs(such as Zipkin, Jeager, OpenCensus) data. 
-Also how to process this kind of data format.
 - UI
   - [Overview](ui-overview.md).

docs/en/concepts-and-designs/backend-overview.md

@@ -23,6 +23,9 @@ even for Zipkin data format. The AOP analysis the segments to get metrics, and p
 the streaming aggregation.
 1. Consider tracing as some kinds of logging only. Just provide save and visualization capabilities for trace. 
 
+Also, SkyWalking accepts trace formats from other project, such as Zipkin, Jeager, OpenCensus.
+These formats could be processed in the two ways too.
+
 ## Metric in OAP
 Metric in OAP is totally new feature in 6 series. Build observability for a distributed system based on metric of connected nodes.
 No tracing data is required.