Dd Triage Flaky Test

Triage Flaky Test

One-line summary: Investigate a specific flaky test — get history, failure pattern, and category, then recommend fix, quarantine, or escalate.

Requires: dd-pup skill (pup CLI installed and authenticated).

Input

Workflow

STEP 0 — Parse Input

Derive repository ID from git if not provided:

git remote get-url origin
# Strip protocol and trailing .git, then lowercase the result
# e.g. https://github.com/DataDog/my-repo.git → github.com/datadog/my-repo

Validation fallback: If STEP 1 returns no results, confirm the correct repository by searching without a repo filter:

pup cicd tests search \
  --query "@test.name:\"<test-name>\"" \
  --from 30d \
  --limit 5

Extract @git.repository.id_v2 from results and retry STEP 1 with the confirmed value.

STEP 1 — Get Flaky Test Details

Preferred — use fingerprint_fqn if known (fingerprint_fqn is a valid CI Visibility search facet, distinct from flaky_state):

pup cicd flaky-tests search \
  --query "fingerprint_fqn:<fqn>" \
  --sort="-last_flaked" \
  --limit 5

Fallback — use name + suite + repo:

pup cicd flaky-tests search \
  --query "@test.name:\"<test-name>\" @test.suite:\"<suite>\" @git.repository.id_v2:\"<repo>\"" \
  --sort="-last_flaked" \
  --limit 10

Omit @test.suite if unknown; if the same test name appears in multiple suites, pick the entry whose suite matches the failing test.

Do not filter by flaky_test_state — return the test regardless of state.

Note: the query filter facet is flaky_test_state; the returned response attribute is flaky_state — these are different names for the same concept; do not use flaky_state:active as a query filter.

Extract from results:

• fingerprint_fqn — unique test identifier; used as the id in STEP 5 write call. If absent, do not proceed to quarantine — see STEP 5.
• flaky_state — current state (active / quarantined / disabled / fixed)
• test_stats.failure_rate_pct — percentage of runs that fail
• flaky_category — root cause category
• codeowners — owning team
• pipeline_stats.total_lost_time_ms — total CI time lost

STEP 2 — Get Recent Failure History

pup cicd tests search \
  --query "@test.name:\"<test-name>\" @test.suite:\"<suite>\" @test.status:fail @git.repository.id_v2:\"<repo>\"" \
  --from 7d \
  --limit 20

Extract:

• Error messages and stack traces (@error.message, @error.stack)
• Failing branches (@git.branch) — branch-specific vs. widespread
• Frequency pattern — random timing or specific conditions
• Unique @ci.pipeline.id values for blast radius (STEP 3)

STEP 3 — Check Blast Radius

Count distinct pipelines impacted using pipeline IDs from STEP 2:

pup cicd events aggregate \
  --query "@ci.status:error @ci.pipeline.id:(<id1> OR <id2> OR ...) @git.repository.id_v2:\"<repo>\"" \
  --compute count \
  --group-by "@ci.pipeline.name" \
  --from 7d

Use the first 10 pipeline IDs from STEP 2 (cap at 10; if more are available, run a second batch and merge results by summing counts per @ci.pipeline.name across batches). Report blast radius as: total number of unique pipelines impacted and whether failures are branch-specific or widespread.

Note: a pipeline failure is not necessarily caused solely by this flaky test — treat blast radius as a signal, not a definitive count.

STEP 4 — Recommend Fix or Quarantine

Use flaky_category from STEP 1 and error messages from STEP 2.

Root cause first:

• Read the full error trace from bottom to top — chained errors hide the real cause; the innermost error is the root cause, not the first line.
• Identify the exact source of nondeterminism (race, ordering, stale state, timing).
• If the root cause is a CI infrastructure problem (runner unavailable, Docker daemon failure, network outage) → do NOT propose a code fix; classify as infra and recommend retry instead.
• If root cause is uncertain and cannot be confirmed from the stack trace → skip fix, go to quarantine.

Fix at the correct layer:

• Test issue → fix in test or test helper only.
• Production bug exposed by the test → fix in production code.
• Shared helper used by multiple tests → fix the helper AND update all call sites; never patch a single test when the root cause is in shared code.

Forbidden — do not propose these:

• Timing hacks: increasing timeouts, adding sleeps, widening time windows, adding retries. A fix that only reduces flake probability without eliminating the root cause is invalid.
• Masking: relaxing assertions (e.g., exact match → at least 1), dropping validations.
• Partial fixes: touching one call site when multiple share the root cause.

Fix patterns by category: