update tidb.net and asktug links

Author: qiancai

explore-htap.md

@@ -108,7 +108,7 @@ If any issue occurs during using TiDB, refer to the following documents:
 - [TiDB cluster troubleshooting guide](/troubleshoot-tidb-cluster.md)
 - [Troubleshoot a TiFlash Cluster](/tiflash/troubleshoot-tiflash.md)
 
-You are also welcome to create [GitHub Issues](https://github.com/pingcap/tiflash/issues) or submit your questions on [AskTUG](https://asktug.com/).
+You are also welcome to create [GitHub Issues](https://github.com/pingcap/tiflash/issues) or submit your questions on [AskTUG](https://pingkai.cn/tidbcommunity/forum/).
 
 ## What's next
 

faq/manage-cluster-faq.md

@@ -109,7 +109,7 @@ You can scale TiDB as your business grows.
 
 ### If Percolator uses distributed locks and the crash client keeps the lock, will the lock not be released?
 
-For more details, see [Percolator and TiDB Transaction Algorithm](https://tidb.net/blog/f537be2c) in Chinese.
+For more details, see [Percolator and TiDB Transaction Algorithm](https://pingkai.cn/tidbcommunity/blog/f537be2c) in Chinese.
 
 ### Why does TiDB use gRPC instead of Thrift? Is it because Google uses it?
 

grafana-tikv-dashboard.md

@@ -12,7 +12,7 @@ The Grafana dashboard is divided into a series of sub dashboards which include O
 
 ## TiKV-Details dashboard
 
-You can get an overview of the component TiKV status from the **TiKV-Details** dashboard, where the key metrics are displayed. According to the [Performance Map](https://asktug.com/_/tidb-performance-map/#/), you can check whether the status of the cluster is as expected.
+You can get an overview of the component TiKV status from the **TiKV-Details** dashboard, where the key metrics are displayed. According to the [Performance Map](https://pingkai.cn/tidbcommunity/forum/_/tidb-performance-map/#/), you can check whether the status of the cluster is as expected.
 
 This section provides a detailed description of these key metrics on the **TiKV-Details** dashboard.
 

tidb-troubleshooting-map.md

@@ -402,7 +402,7 @@ Check the specific cause for busy by viewing the monitor **Grafana** -> **TiKV**
 
     - The database related passwords in all the DM configuration files should be encrypted by `dmctl`. If a database password is empty, it is unnecessary to encrypt the password. Cleartext passwords can be used since v1.0.6.
     - During DM operation, the user of the upstream and downstream databases must have the corresponding read and write privileges. Data Migration also [prechecks the corresponding privileges](/dm/dm-precheck.md) automatically while starting the data replication task.
-    - To deploy different versions of DM-worker/DM-master/dmctl in a DM cluster, see the [case study on AskTUG](https://asktug.com/t/dm1-0-0-ga-access-denied-for-user/1049/5) in Chinese.
+    - To deploy different versions of DM-worker/DM-master/dmctl in a DM cluster, see the [case study on AskTUG](https://pingkai.cn/tidbcommunity/forum/t/dm1-0-0-ga-access-denied-for-user/1049/5) in Chinese.
 
 - 6.1.3 A replication task is interrupted with the `driver: bad connection` error returned.