chore: bound mempool size by default (cosmos#14135)

Author: tac0turtle

server/config/config.go

@@ -304,7 +304,7 @@ func DefaultConfig() *Config {
 			},
 		},
 		Mempool: MempoolConfig{
-			MaxTxs: 0,
+			MaxTxs: 5_000,
 		},
 	}
 }

server/config/toml.go

@@ -225,6 +225,9 @@ fsync = "{{ .Streamers.File.Fsync }}"
 ###############################################################################
 
 [mempool]
+# Setting max-txs to 0 will allow for a unbounded amount of transactions in the mempool.
+# Setting max_txs to negative 1 (-1) will disable transactions from being inserted into the mempool.
+# Setting max_txs to a positive number  (> 0) will limit the number of transactions in the mempool, by the specified amount.
 max-txs = "{{ .Mempool.MaxTxs }}"
 
 `