Issue with the "Load Balancing" doc RE: in-region loadbalancing

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调研方向

打开 reference/load-balancing.html.md 并检查引用的 Load Balancing 示例。首先与 networking 团队确认预期的 Load Balancing 行为,然后更新示例以匹配该行为。当文档中 soft_limit 和 hard_limit 的路由顺序准确无误时,即表示完成。

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描述

I found an issue with this document.

Title: Load Balancing
Location: https://fly.io/docs/reference/load-balancing/
Source: https://github.com/superfly/docs/blob/main/reference/load-balancing.html.md

Describe the issue

The Proxy as currently configured will avoid routing requests outside a given region until all machines in that region are over their hard_limit. The current examples state that we'll start routing to nearby regions once all machines in them are over the soft limit. This is incorrect!

This example section needs updating:

In this contrived example, all of the users are currently in Amsterdam, so the traffic is arriving at one of the Fly.io edges in Amsterdam. Here’s what happens as the number of concurrent HTTP requests from users in Amsterdam increases:

60 concurrent requests: Requests are divided evenly between the 3 Machines in the ams region. Closeness of the worker and edge will determine which of the 3 Machines each request goes to.
61+ concurrent requests: 60 of those requests will be sent to the 3 Machines in the ams region and the rest will be sent to the closest Machines in other regions.
200+ concurrent requests: All Machines are at their soft_limit, so Fly Proxy will start routing requests to the ams Machines again. For example, the 201st concurrent request will go to a Machine in the ams region that is currently at its soft_limit.
250 concurrent requests: All Machines are at their hard_limit. The 251st concurrent request will get queued by Fly Proxy until a Machine is below its hard_limit.
Addtional info

Doublechecking with the networking team to ensure that the change from what's documented was intentional. Once that's confirmed I can make a PR to update this

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