They are complementary solutions, not substitutes. Load balancers distribute traffic among servers and are a key component to enable horizontal scalability. Throttling is a prophylactic feature that prevents attackers or greedy consumers from overutilizing capacity and depriving it from other legitimate users. This library relates to the latter.
Unfortunately the title of the GitHub repo ("A Go library for serving resources fairly") is misleading. This is not a server; it's a library that a server can utilize to determine whether a request has exceeded fairness bounds and should be rejected with an HTTP 429 (too many requests) response.
Unfortunately the title of the GitHub repo ("A Go library for serving resources fairly") is misleading. This is not a server; it's a library that a server can utilize to determine whether a request has exceeded fairness bounds and should be rejected with an HTTP 429 (too many requests) response.