[dns-operations] "off label" use of PTR records for fanout

[Jared Mauch]

Often folks will use TXT with a low TTL and use a specific label path to perform this function. 

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> On Jun 15, 2023, at 4:22 PM, Fred Morris <m3047 at m3047.net> wrote:
> 
> Hello,
> 
> I'm using DNS to retrieve some distributed telemetry data from multiple
> servers. To facilitate this I have an FQDN which resolves to a set of
> PTR records. If there's a generally accepted better option, let me know.
> 
> If you just want to bike shed this fine, I invite you to email me
> directly as I think this is already tangential to the purpose of this list.
> 
> Thank you for understanding...
> 
> --
> 
> Fred Morris
> 
> --
> 
> (Are you still reading?)
> 
> I'm basically using PTR records like CNAME, but with the semantics "try
> all of these". The normal semantics of DNS resolution have the objective
> of finding "the one (best) answer from the (best) server"
> notwithstanding that the answer may consist of multiple answers,
> presuming in a panglossian fashion that the first answer we get is the
> best one for us at this point in time. Can't use CNAME because the DNS
> builds semantics around it which would interfere the semantics here. I
> presume the same accrues to e.g. SRV records. It just isn't expecting us
> to try them all as a matter of course.
> 
> 
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