HAPRoxy Rate Limiting - Stick-Table Entry Expiration
Solution 1:
To check the counter without updating its value, you can use table_http_req_rate. In your case you can put the below config in your frontend, so that you can deny the request before reaching the stick-table.
http-request deny if { key,table_http_req_rate(name_of_your_table) gt 30 }
More reference: Stick table doc