[bind10-dev] changing brief description of log message require new message ID?

[Jeremy C. Reed]

If the format of the logged brief description changes, then possibly a 
log parser may break or get wrong data.

Should we document a decision that if a log message's brief description 
changes, we require a new message ID?

Note this is not for the longer description which is not logged.

You can see example in my commit 1e702fae4c9adbd7134a739dee28c868a15f0b3e

old:

    2011-08-15 14:37:22.991 DEBUG [b10-resolver.cache] CACHE_RRSET_INIT 
initializing RRset cache for IN RRsets of class 10000
    
new:
    
    2011-08-16 11:01:50.899 DEBUG [b10-resolver.cache] CACHE_RRSET_INIT 
initializing RRset cache for 10000 RRsets of class IN
    
(I already fixed that problem but chose to keep same message ID since it 
is not production yet.)