doc: Add a note on scalers which support float target value

[JorTurFer]

Signed-off-by: Jorge Turrado jorge_turrado@hotmail.es

After merging the PR to support mili unit in core, there are some scalers that support float as target value (because the scaler logic already supported float64 and it made sense).

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Related kedacore/keda#3135

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[tomkerkhove]

As an end-user, how much do I care about this? If I do, might need some more background on what this means maybe? Scaler typically does the heavy lifting on this and in some scalers this does not make sense - For example, I won't be scaling for 30.5 messages.

Maybe it's better to update the scalers where this is useful?

[JorTurFer]

As an end-user, how much do I care about this? If I do, might need some more background on what this means maybe? Scaler typically does the heavy lifting on this and in some scalers this does not make sense - For example, I won't be scaling for 30.5 messages.

Maybe it's better to update the scalers where this is useful?

you are right, on it specifying the parameters which accepts floats

BTW, all the scalers in this PR support float 😄

[tomkerkhove]

They do support it, but does it make sense? :D Anyway it's up to them but for SB it's less relevant

[JorTurFer]

Yes, the scalers inclued in this PR support float because it's relevant.
I mean, you can get a rate from 0 to 1 using Azure Monitor, or database scalers, etc.
The only case where could not be relevant is RabbitMQ using queues, but there is a remark explaining that this only applies in case of message rate.
ie, service bus scaler doesn't support float because doesn't make sense

[JorTurFer]

@zroubalik , does this match with your expectations too?

[zroubalik]

Looking good, thanks for this!