Hello @venkatas ,
The complete line of such information likes:
2021-10-09T15:13:28 [SORTER ]E: End of time-line reached and all records were applied, task will stop  (sorter_transaction.c:3486)
The error codes (like 1020101, 1002510, 1022601 etc ) are Replicate internal error codes . I'm afraid it's meaningful for SME/R&D only. In general we use other error codes or native error number which returned from backend DBs for troubleshooting. for example the lines:
2021-08-24T19:39:13:90989 [SOURCE_CAPTURE ]E: RetCode: SQL_ERROR SqlState: 08001 NativeError: 104 Message: [Microsoft][ODBC Driver 17 for SQL Server]TCP Provider: Error code 0x68  (ar_odbc_conn.c:563)
2021-08-24T19:39:13:91087 [SOURCE_CAPTURE ]E: Failed to connect  (sqlserver_log_utils.c:2185)
The backend DB returns codes/Native Error (in Hex "0x68", in Dec "104") helps for troubleshoot.