improvement: add note about measure units of jitter metric

[zifter]

What type of PR is this?
/kind documentation

What this PR does / Why we need it:
This PR improves documentation

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.

[XAMPPRocky]

Thank you for your PR, and congrats on your first contribution! 🎉

[XAMPPRocky]

@markmandel I think something went wrong with cloud build.

[XAMPPRocky]

@zifter Oh you, also need to sign the CLA for this be merged.

[zifter]

@XAMPPRocky i've done it a long time ago
there is an issue with bot, not with my CLA
4ef2ec2 Author: @quilkin-bot <84364394+quilkin-bot​@users.noreply.github.com>

[markmandel]

Weird, the quilkin bot is failing CLA. It shouldn't be a thing that it even worries about. I'll override it if need be.

[markmandel]

/gcbrun

(this is needed for people who don't have read access to the repo so the Cloud Build script runs - I forgot this as well)

[quilkin-bot]

Build Failed 😭

Build Id: a63198af-c443-4d61-bb3e-76db709a506e

Status: FAILURE

• Cloud Build view
• Cloud Build log download

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Filter with the Git Commit c7f5099 within us-docker.pkg.dev/quilkin/ci//quilkin to see if a development image is available from this build, and can be used for debugging purposes.

Development images are retained for at least 30 days.

[markmandel]

Ah, found the issue with the bot, that should be fixed now. Weird flake in the unit tests:

---- ipv6_firewall_allow stdout ----
thread 'ipv6_firewall_allow' panicked at src/components/proxy.rs:94:91:
called `Result::unwrap()` on an `Err` value: Os { code: 98, kind: AddrInUse, message: "Address already in use" }
stack backtrace:
   0: rust_begin_unwind
             at /rustc/7cf61ebde7b22796c69757901dd346d0fe70bd97/library/std/src/panicking.rs:647:5
   1: core::panicking::panic_fmt
             at /rustc/7cf61ebde7b22796c69757901dd346d0fe70bd97/library/core/src/panicking.rs:72:14
   2: core::result::unwrap_failed
             at /rustc/7cf61ebde7b22796c69757901dd346d0fe70bd97/library/core/src/result.rs:1649:5
   3: core::result::Result<T,E>::unwrap
             at /rustc/7cf61ebde7b22796c69757901dd346d0fe70bd97/library/core/src/result.rs:1073:23

Will retry.