Add dashboard widget validation API

[api-clients-generation-pipeline]

See DataDog/datadog-api-spec#6420 Test branch datadog-api-spec/test/jiawen.zhu/DASHB-1048/bulk-widget-validation-openapi

[datadog-datadog-prod-us1]

 

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⚠️ Warnings

🚦 1 Pipeline job failed

Run Tests | test / test (16, ubuntu-latest) — 🔧 Needs a code fix, caused by this PR

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4 errors encountered during test executions: Missing time file and null reference for OffsetDateTime in tests.

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CI on my pull request is failing. Help me find and fix the root cause of each failing job below — they were flagged as caused by changes in this PR, so focus on the diff. For each job, explain the failure and propose a fix.

Branch: datadog-api-spec/generated/6420

Run Tests | test / test (16, ubuntu-latest)
Commit: 114d4bb985f642be827085c8b3fb57afdb757da7
Error (code / test):
4 errors encountered during test executions: Missing time file and null reference for OffsetDateTime in tests.
CI job: https://github.com/DataDog/datadog-api-client-java/actions/runs/32146599050/job/95741738164

🧪 1 Test failed in 1 job

Run Tests | test — ❌ 1 test failed

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↳ ❌ Validate dashboard widgets returns "OK" response from classpath:com/datadog/api/client/v2/api/dashboards.feature:Dashboards #2  

ℹ️ Info

No other issues found (see more)

❄️ No new flaky tests detected

🔄 Datadog retried 1 test - 0 passed on retry

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[github-actions]

This PR has been automatically marked as stale because it has not had activity in the last 30 days.
If there is no activity for another 90 days, this issue will be automatically closed.

[dd-prapprover-prod-77c48c]

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🛠️ PRApproval Status

• ✅ PR is eligible for auto-approval by rule datadog-api-spec-generated-clients - 2026-09-18T00:12:21Z
• ⬜ CI tests passed
• ⬜ Approved
• Manual merge required: this rule does not auto-merge.

➡️ Current phase: CI tests failed. Please fix the failing tests and rerun the workflow, click Workflow Link -> Workflow Starter Link -> Start Workflow

[nogates]

Closing because this PR was generated by the pre-migration DataDog/datadog-api-spec