[Bug 280097] Warning printed when FIBs are expanded is unhelpful and confusing

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280097

--- Comment #15 from Zhenlei Huang <zlei@FreeBSD.org> ---
(In reply to Jeremy Cooper from comment #13)

> I am reopening this because the main problem was the content of the message,
> not problems about when it is displayed. As it stands, the current solution
> still retains the CONFUSING wording.

Ah, I think the original warning message
> WARNING: Adding ifaddrs to all fibs has been turned off by default. Consider tuning net.add_addr_allfibs if needed
says exactly what it intends. Please note `Adding ifaddrs to all fibs` is a
feature although it is not highlighted in the warning message. I'd admit that
`ifaddrs` is more a developer friendly word, it refers to `interface addresses`
exactly.

> I propose that the warning be changed ever so slightly so that the user can tell

> 1. When it was generated (when net.fibs is adjusted)
Now only when the first time increasing `net.fibs` and `net.add_addr_allfibs ==
0`.

> 2. That the warning is a reminder, not the detection of a problem.
Emm, the message was introduced to be a WARNING, exactly. And a WARNING does
not necessarily mean a problem is detected. In this case it is something
important ( a noticeable breaking change ) that user should be aware.

(In reply to Jeremy Cooper from comment #14)
> Pardon me, that was my old wording. I think I proposed the following in my last round:
>+               printf("%s adjusted to %d. REMINDER: "
The `adjusted to` is redundant. When doing the tuning
```
# sysctl net.fibs=2
net.fibs: 1 -> 2
```
The console should print the new value (by default).
>+                       "Interface addresses are no longer automatically added "
>+                       "to additional FIBs. Consider setting %s if needed\n",
The `additional` is not accurate. If so then what is the current FIB ?

I'd prefer keep `tuning`. I think it is more natural. We are tuning a sysctl
knob.
>+                       "net.fibs",
>+                       num_tables,
>                        "net.add_addr_allfibs");
>+


If you insist then I'd propose to reword `ifaddrs` to `interface addresses`.
The message will end up with
```
WARNING: Adding interface addresses to all fibs has been turned off by default.
Consider tuning net.add_addr_allfibs if needed
```

Is it clear enough to you ?

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