@jfb thanks for the feedback.
I tried to play by the rules...
$ pihole debug
.......
*** [ DIAGNOSING ]: Pi-hole diagnosis messages
id timestamp type message blob1 blob2 blob3 blob4 blob5
1 2020-12-29 19:57:45 DNSMASQ_CONFIG illegal repeated keyword at line 1 of /etc/dnsmasq.d/02-piho
$ cat /etc/dnsmasq.d/02-pihole.conf
log-facility=local5
maybe it's broken, though it's still likely I've fat fingered something. Reading this post led me to believe that I could set this value in a subsequent file, but it seems that pihole doesn't like it if it sees it twice?
With regard to your suggestion to "use a symlink" can you provide a bit more details?