v3.0.2

• Fix the unit error that the Disk Performance monitor treats seconds as milliseconds #840
• Add the log4j configuration file in Spark #841
• Fix the issue that the Prometheus configuration file is generated in the wrong format when Binlog is enabled and Kafka or ZooKeeper is configured #844
• Fix the issue that the pessimistic-txn configuration parameter is left out in the generated TiDB configuration file #850
• Add and optimize metrics on the TiDB Dashboard #853
• Add descriptions for each monitoring item on the TiDB Dashboard #854
• Add the TiDB Summary Dashboard to better view the cluster status and troubleshoot issues #855
• Update the Allocator Stats monitoring item on the TiKV Dashboard #857
• Fix the unit error in the Node Exporter’s alerting expression #860
• Upgrade the TiSpark jar package to v2.1.2 #862
• Update the descriptions of the Ansible Task feature #867
• Update the expression of the local reader requests monitoring item on the TiDB Dashboard #874
• Update the expression of the TiKV Memory monitoring item on the Overview Dashboard, and fix the issue of wrongly displayed monitoring #879
• Remove the Binlog support in the Kafka mode #878
• Fix the issue that PD fails to transfer the Leader when executing the rolling_update.yml operation #887