Fix defaulting in router config

[BrynCooke]

There are two types of serde defaulting:

• container
• field

Container level defaulting will use an instance of the default implementation and take missing fields from it. Field level defaulting uses either the default implementation or optionally user supplied function to initialize missing fields.

When using field level defaulting it is essential that the Default implementation of a struct exactly match the serde annotations.

A test checks to ensure that field level defaulting is not used in conjunction with a Default implementation and gives guidance on resolution.

Description here

Fixes #4000

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Checklist

Complete the checklist (and note appropriate exceptions) before the PR is marked ready-for-review.

• Changes are compatible¹
• Documentation² completed
• Performance impact assessed and acceptable
• Tests added and passing³
  • Unit Tests
  • Integration Tests
  • Manual Tests

Exceptions

Note any exceptions here

Notes

Footnotes

1. It may be appropriate to bring upcoming changes to the attention of other (impacted) groups. Please endeavour to do this before seeking PR approval. The mechanism for doing this will vary considerably, so use your judgement as to how and when to do this. ↩

2. Configuration is an important part of many changes. Where applicable please try to document configuration examples. ↩

3. Tick whichever testing boxes are applicable. If you are adding Manual Tests, please document the manual testing (extensively) in the Exceptions. ↩

[github-actions]

@BrynCooke, please consider creating a changeset entry in /.changesets/. These instructions describe the process and tooling.

[router-perf]

CI performance tests

• events_big_cap_high_rate - Stress test for events with a lot of users, deduplication enabled and high rate event with a big queue capacity
• events_without_dedup - Stress test for events with a lot of users and deduplication DISABLED
• events - Stress test for events with a lot of users and deduplication ENABLED
• large-request - Stress test with a 1 MB request payload
• step - Basic stress test that steps up the number of users over time
• xlarge-request - Stress test with 10 MB request payload
• reload - Reload test over a long period of time at a constant rate of users
• no-graphos - Basic stress test, no GraphOS.
• xxlarge-request - Stress test with 100 MB request payload
• step-jemalloc-tuning - Clone of the basic stress test for jemalloc tuning
• const - Basic stress test that runs with a constant number of users

[SimonSapin]

It’d be nice if this new crate can use version 1.0 of quote and syn, to avoid compiling multiple versions of those libraries. But this isn’t a blocker.

[BrynCooke]

I'll do this, release 0.1.1 and renovate can pick it up later.