STL-2767: Retry on HTTP 429 with Retry-After support

[roman-kiselevich]

Problem

The public rate limits for the metadata-api provisioning APIs (STL-2767) are now rolled out in gitops-panther. The gateway responds with HTTP 429 and a Retry-After header when a limit is exceeded, but the Python SDK has no retry handling — every 429 surfaces as an ApiException to the caller.

Summary

Adds GoodDataApiClientRetryConfig and applies the same urllib3.Retry policy to both transport paths:

• The generated gooddata-api-client — via Configuration.retries.
• The direct requests.post in GoodDataApiClient._do_post_request — via a Session with HTTPAdapter mounted using the same Retry object.

Defaults: 10 retries on 429 across GET/HEAD/OPTIONS/TRACE/POST/PUT/PATCH/DELETE, backoff_factor=0.5, backoff_max=60s. Retry-After is honoured automatically by urllib3 when present; backoff only applies when the server omits the header.

The config is exposed at the top level (from gooddata_sdk import GoodDataApiClientRetryConfig) and accepted by both GoodDataApiClient.__init__ and GoodDataSdk.create.

Reasoning

The retry policy lives in the hand-written SDK wrapper (packages/gooddata-sdk/src/gooddata_sdk/client.py) rather than in the auto-generated gooddata-api-client/, because the latter is regenerated from OpenAPI templates and any direct edits would be overwritten. Configuration.retries is the documented hook the generator exposes for exactly this purpose.

POST/PUT/PATCH/DELETE are included in allowed_methods because the rate-limited endpoints are provisioning calls — retrying them is safe since the gateway returns 429 before the request is processed.

[codecov]

Codecov Report

❌ Patch coverage is 91.42857% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.06%. Comparing base (e1d6ad4) to head (9012fae).

Files with missing lines	Patch %	Lines
packages/gooddata-sdk/src/gooddata_sdk/client.py	91.17%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1631      +/-   ##
==========================================
+ Coverage   79.03%   79.06%   +0.02%     
==========================================
  Files         231      231              
  Lines       15634    15667      +33     
==========================================
+ Hits        12357    12387      +30     
- Misses       3277     3280       +3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.