dheerajturaga opened a new pull request, #75037:
URL: https://github.com/apache/airflow/pull/75037

   ### Stack
   
   Stacks on #75036. Stack index: 5 of 20.
   
   A PR from a fork cannot target a fork branch, so each PR in the stack is 
based on `main` and contains every commit below it; only the top commit is new. 
Review only the commit "AIP-125: Discover webhook-sources from provider.yaml"; 
the commits below it belong to earlier PRs in the stack.
   
   ### Status
   
   Draft. [AIP-125 (Inbound 
Webhooks)](https://lists.apache.org/thread/p3dpnor4zwko8tldpncj6ftj1bpp18q7) is 
under discussion on dev@ and not yet voted; this stack is its proof of concept 
so that voters can run it, and nothing should merge before the vote. The 
feature is opt-in (only `airflow api-server --apps webhooks` serves deliveries) 
and experimental; no unauthenticated route is reachable until stack PR 18, 
which merges last.
   
   ### Why
   
   Source types are shipped by providers, so core finds them in provider 
metadata. Discovery records each declaration without importing it; the class is 
imported when a webhook first needs it. A source type declared more than once 
is served by none of its declarers: the usual first-wins rule follows package 
names, which would let a package that sorts earlier replace another provider's 
signature check.
   
   ### What to look at
   
   - The conflict rule instead of first-wins. The next PR adds `[webhooks] 
source_type_owners` to pick a winner.
   - The `provider.yaml` schema is strict (a source type is 
`[a-z][a-z0-9_]{0,63}`, to fit its `String(64)` column). The runtime schema 
leaves entries untyped so one bad entry does not drop the whole provider; 
`ProvidersManager` checks them instead.
   - `get_webhook_source_class` caches each import, failures included, and 
leaves the `WebhookSource` check to the caller.
   - New `airflow providers webhook-sources` command; the provider.yaml check 
fails on duplicate source types and unregistered `WebhookSource` subclasses.
   
   ### Testing
   
   - `test_providers_manager.py`, `test_provider_yaml_schema.py` and 
`test_provider_command.py` passed under breeze on SQLite, Postgres and MySQL. 
After the last fixes, the tests were rerun on SQLite and Postgres, and the 
final head passed again on MySQL.
   - `breeze build-docs` is clean for the providers summary docs.
   
   ---
   
   ##### Was generative AI tooling used to co-author this PR?
   
   - [X] Yes — Claude Code (Opus 5.5)
   
   Generated-by: Claude Code (Opus 5.5) following [the 
guidelines](https://github.com/apache/airflow/blob/main/contributing-docs/05_pull_requests.rst#gen-ai-assisted-contributions)
   
   ---
   
   * Read the **[Pull Request 
Guidelines](https://github.com/apache/airflow/blob/main/contributing-docs/05_pull_requests.rst#pull-request-guidelines)**
 for more information. Note: commit author/co-author name and email in commits 
become permanently public when merged.
   * For fundamental code changes, an Airflow Improvement Proposal 
([AIP](https://cwiki.apache.org/confluence/display/AIRFLOW/Airflow+Improvement+Proposals))
 is needed.
   * When adding dependency, check compliance with the [ASF 3rd Party License 
Policy](https://www.apache.org/legal/resolved.html#category-x).
   * For significant user-facing changes create newsfragment: 
`{pr_number}.significant.rst`, in 
[airflow-core/newsfragments](https://github.com/apache/airflow/tree/main/airflow-core/newsfragments).
 You can add this file in a follow-up commit after the PR is created so you 
know the PR number.
   


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