Rate limiting middleware limitation.

[gsinha-cb]

Hello,

In Rate Limiter Middleware , it is documented that it is not best option for large number of different identifiers (>16k) and as per source code this limitation is due to GO Map .

Can you please elaborate why this limitation exist and what kind of issues can be seen if we cross this limit?

-Gaurav

[aldas]

I think it was discussed in this PR #1724 but @lammel could probably clarify as he was the one adding these remarks there