broaden the requestTrace attachment accessor

[carterkozak]

==COMMIT_MSG==
broaden the requestTrace attachment accessor
==COMMIT_MSG==

This allows us to pull the attachment value from one of the many types which wrap an HttpServerExchange and delegate to its attachments, for example WebSocketHttpExchange (not Attachable) and ServerSentEventConnection (Attachable).

[changelog-app]

Generate changelog in changelog/@unreleased

What do the change types mean?

• feature: A new feature of the service.
• improvement: An incremental improvement in the functionality or operation of the service.
• fix: Remedies the incorrect behaviour of a component of the service in a backwards-compatible way.
• break: Has the potential to break consumers of this service's API, inclusive of both Palantir services
  and external consumers of the service's API (e.g. customer-written software or integrations).
• deprecation: Advertises the intention to remove service functionality without any change to the
  operation of the service itself.
• manualTask: Requires the possibility of manual intervention (running a script, eyeballing configuration,
  performing database surgery, ...) at the time of upgrade for it to succeed.
• migration: A fully automatic upgrade migration task with no engineer input required.

Note: only one type should be chosen.

How are new versions calculated?

• ❗The break and manual task changelog types will result in a major release!
• 🐛 The fix changelog type will result in a minor release in most cases, and a patch release version for patch branches. This behaviour is configurable in autorelease.
• ✨ All others will result in a minor version release.

Type

• Feature
• Improvement
• Fix
• Break
• Deprecation
• Manual task
• Migration

Description

broaden the requestTrace attachment accessor

Check the box to generate changelog(s)

• Generate changelog entry

[carterkozak]

I don't love exposing this directly since it allows the attachment to be removed, and we don't really expect anyone to do that. The risk is small, and this unblocks applying tracing to some additional libraries without consuming that functionality directly into tracing-undertow. In particular WebSocketHttpExchange wraps an HttpServerExchange and exposes its attachments, but doesn't implement Attachable or expose the underlying exchange directly.

[autorelease3]

Released 6.20.0