netwatch-notify: do not update with record in cache•••Using `:resolve` we have just one address, but chances are several
records do exist. These end up in cache, so we are happy to find them
there - no need to update then.
telegram-chat: add (and increase) random delay on error•••Chances are that two devices schedule the script (nearly) simultaneously.
Causing a lot of failures from fetch. Instead of forcing a retry on
*every* invocating we add (and increase) a random delay, that is
slowly decreasd on success. This should minimize failures...
Christian Hesse