cloudflare: support comment field

[cyclingwithelephants]

What would you like to be added:
cloudflare offer comments attached to their DNS records, up to 100 characters. It would be great to be able to configure this using a external-dns.alpha.kubernetes.io/cloudflare- style annotation, or potentially a CLI flag.

Why is this needed:
This would help to make explicit the DNS records that are externally managed, the last time they were updated, perhaps their cluster, etc.

[MaGaroo]

I can work on this issue. Let me know if it is accepted.

[johngmyers]

Sounds like that would be a good place to put the labels, so one could use the noop registry.

[davidegirardi]

Aren't record-tags better to store labels then?

[johngmyers]

May well be. I don't know much about Cloudflare.

[davidegirardi]

The comment is a string and tags is an array of strings in the request body. They have limitations depending on the subscription in use.

[morremeyer]

I would very much like to be able to use the comment field instead of TXT records as registry. To make this compatible with all Cloudflare subcriptions, it should however be <= 100 characters.

[matrix-root]

Is somebody working on this?

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/lifecycle stale

[morremeyer]

Not stale, I might get to work on this soon-ish.

[morremeyer]

/remove-lifecycle stale

[andyr8939]

It would be really great to have support for Cloudflare Tags as well, as these are more useful because of being able to search and group based on them. Example when you have a large zone where not everything is managed by external-dns, being able to see quickly at a glance what is managed by external-dns and what is terraform via tags would be useful.

Example....

[stepanbaghdasaryan]

Is somebody working on this?