Saw this in logs today coming from a cluster running slony-1.2.9 against 
pg-8.2.4:

2007-05-16 13:29:08 CDT DEBUG1 cleanupThread:    0.203 seconds for delete logs
NOTICE:  Slony-I: cleanup stale sl_nodelock entry for pid=7035
CONTEXT:  SQL statement "SELECT  "_ar_primary".cleanupNodelock()"
        PL/pgSQL function "cleanupevent" line 77 at perform
NOTICE:  Slony-I: cleanup stale sl_nodelock entry for pid=7035
CONTEXT:  SQL statement "SELECT  "_ar_primary".cleanupNodelock()"
PL/pgSQL function "cleanupevent" line 77 at perform
2007-05-16 13:30:35 CDT DEBUG1 cleanupThread:    0.019 seconds for 
cleanupEvent()
2007-05-16 13:30:35 CDT DEBUG1 cleanupThread:    0.017 seconds for delete 
logs
WARNING:  nonstandard use of \\ in a string literal at character 99
HINT:  Use the escape string syntax for backslashes, e.g., E'\\'.
WARNING:  nonstandard use of \\ in a string literal at character 1251
HINT:  Use the escape string syntax for backslashes, e.g., E'\\'.

Everything appears to be working correctly, but wasn't sure if this was an 
'expected' message to see in log file.

-jason