Here's the wiki entry about long values in general:
osm.wiki/Multiple_values#Numbered_suffix_in_key

You can always check Taginfo for specific tag:
https://taginfo.openstreetmap.org/keys/addr:flats#similar
If you check e.g. addr:flats:1 you see that is in use since 2015, although this is not very common for obvious reasons. When looking at other tags, you'll find many without the colon - but as described in the Wiki these are mostly generated by old imports and where never properly discussed and documented.

I don't think there is any way to shorten the values, the numbers I see are just too diverse.

Hi,
you used keys like "addr:flats10" in this import. Adding a number directly after the key is uncommon - it's much more usual to add it after a colon like
addr:flats:10. Could you check & change that?

Hi,
could you check this platform, its gtfs keys don't seem to be right, way/1336560061

Hi,
you wrote
"amenity=kick-scooter_parking refusé par signalement Osmose".

That is a documented tag that is in use hundreds of times. The tagging was correct and the error must be on the side of Osmose.

Hallo,
schau mal nach dieser Haltestelle:
Die hat ein uic_number, die aussieht wie die uic_ref, und eine ungewöhnliche uic_ref.
node/6772936834

Hi,
please check this signal, it got a strange 'rht = normal' tag:
node/12405397079

Please check this import. There are 212 ways without any proper tag.

Also, important documentation according to our import guidelines is missing.
osm.wiki/Import/Guidelines

The best way is to support the already existing tag "toilets:wheelchair:grab_rails".

Now I found it. I'm still not sure about the name - there is no name given. Could you verify that the two name tags are really the actual name the monument is known by and not just describing it?

Hi,
could you check this monument? It seems the 'name' tag is actually a 'description' and 'sculpture:name' should be 'name'. Unfortunately I can't find information using the memorialgenweb reference number.

Ich weiß nicht, wer diesen Eintrag im Wiki gemacht hat, aber das stimmt nicht. Tags mit _1 gibt es (abgesehen von einigen uralten Imports) nicht, und wird von den meisten Anwendungen nicht unterstützt. Bei Straßen-Tags wie parking oder sidewalk wüsste ich kein Beispiel, wo das unterstützt würde.

Der einzige Weg das sinnvoll zu erfassen, ist die Straße in kleine Abschnitte zu unterteilen. Etwas unhandlich, aber anders geht es leider nicht.

Der einzige Weg

I only changed a new tag to one that is already in use and follows the common scheme of using a *:for suffix to tag the designated users of an amenity.

It's impossible to check the whole forum for completely unrelated thread titles for every change I make.

For the "shelter" there is already the tag "winter_room" and "capacity:winter_room".
The capacity of the hut can be given simply as "capacity".

Tagging chief/guardian/operator at the same time seems a bit difficult. There is "contact:person" that might be used for the person you get into contact with in case of (remote) questions.

non_catered would be simply "kitchen=yes", not a cuisine tag.

half_board can be tagged as "breakfast" and "dinner".

That's possible - I don't have further kmowledge. All I did was changing the uppercase tags to the correct spelling.

I'd offer my help, but I have no idea what the tags mean. What's the difference between hut/shelter, what's a chief/guardian if not the local people operating the hut, and what is 'non_catered'?

Hi,
you used many tags here that are not in use in any other place.
Could you check if they are actually needed and there is no common tag to replace them?

capacity:hut = 24
capacity:shelter = 24
cuisine = non_catered
half_board = yes
hut:chief = Hobi Daniel
hut:guardian = Zwyer Daniela

Would you please once and for all stop reverting my edits? The tags you add again and again are not documented and not used by anybody else.

Diese Straße hat eine Menge parking:restriction Tags, die sich teilweise widersprechen. Was gilt denn genau? Hast du ein Foto des Schildes?

Hi,
you used new tags like "recycling:container:silver" here. Could you check if it's possible to add common tags for materials that can be disposed of here instead of colors?
amenity=recycling#Recycling

Hi,
I found a variety of "grab_bars" tags:

toilets:grab_bars:left
toilets:grab_bars:right
toilets:grab_bar:right
toilets:grab_bars:rigth
toilets:grab_bar:left
toilets:grab_bars_right

The common and documented tag for this ist "toilets:wheelchair:grab_rails":
osm.wiki/Key%3Atoilets%3Awheelchair%3Agrab_rails

Could you check & change these?