[Tool] Add diagnostics.sql script for troubleshooting (StarRocks#28428)

Signed-off-by: Alex Zhu <[email protected]>

Author: sduzh

tools/diagnostics.sql

@@ -0,0 +1,23 @@
+-- diagnostics.sql
+
+-- This script collects key system information to help diagnose 
+-- and troubleshoot performance issues.
+
+-- This data can help identify system bottlenecks, 
+-- debug problems, and guide optimization efforts.
+
+-- example:
+-- cat diagnostics.sql | mysql -h127.0.0.1 -P9030 -uroot |gzip > diagnostics.gz
+
+show frontends\G;
+show backends\G;
+show variables\G;
+admin show frontend config\G;
+select * from information_schema.loads\G;
+select * from information_schema.routine_load_jobs\G;
+select * from information_schema.be_metrics\G;
+select * from information_schema.be_bvars\G;
+select * from information_schema.be_cloud_native_compactions\G;
+select BE_ID, NAME, VALUE from information_schema.be_configs\G;
+show proc '/compactions'\G;
+select BE_ID, LOG from (select BE_ID, TIMESTAMP, LOG from information_schema.be_logs where LEVEL='W' or LEVEL='E' order by TIMESTAMP DESC limit 5000) t order by BE_ID, TIMESTAMP ASC;