CI Failure Log Analyzer

CI Failure Triage

{{ severityBadge.label }} {{ detectedProvider.label }} {{ analysis.lineCount }} lines {{ analysis.slowCount }} slow

CI job log:

Paste GitHub Actions, GitLab CI, CircleCI, Jenkins, or similar job output. The analyzer keeps the original line numbers.

{{ fileStatus || 'Drop a .log or .txt file onto the textarea.' }}

CI provider profile:

Choose Auto for mixed logs; force a provider when annotations or section markers were stripped.

Slow step threshold:

Use 60-300 seconds for most jobs; set 0 to surface every parsed duration.

sec

Log analysis needs attention

{{ error }}

Pipeline label:

Optional human label for the job, workflow, or incident branch.

Extra failure terms:

Comma or newline separated. Leave blank to use only built-in CI patterns.

Context lines:

Range: 0-4 lines around each failure signal.

lines

Maximum signals:

Range: 5-80 rows. JSON records the cap and total detected count.

rows

Mask secret-like values:

Leave on before sharing CSV, DOCX, screenshots, or JSON outside the build team.

Line	Severity	Stage	Failure class	Snippet	Confidence	Copy
No failure, warning, or slow-step signals were detected in the current log.
{{ row.lineNumber }}	{{ row.severity }}	{{ row.stageLabel }}	{{ row.categoryLabel }}	{{ row.snippet }}	{{ row.confidence }}

Stage	Failures	Warnings	Slow steps	Top clue	Stage action	Copy
No stage-level signals are available.
{{ row.stage }}	{{ row.failures }}	{{ row.warnings }}	{{ row.slow }}	{{ row.topClue }}	{{ row.action }}

Rank	Failure class	Evidence	Affected stage	Next action	Why it matters	Copy
No action queue is available until the log contains a triage signal.
{{ row.rank }}	{{ row.category }}	{{ row.evidence }}	{{ row.stage }}	{{ row.nextAction }}	{{ row.why }}

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Continuous integration (CI) logs usually fail in layers: a command exits non-zero, a test runner prints a stack trace, a dependency tool reports a registry problem, or the hosted runner times out after the useful clue has already scrolled past. The CI Failure Log Analyzer turns one pasted job log or focused excerpt into a ranked triage view, keeping the original line numbers so the result can be checked against the raw CI job page.

The analyzer looks for failure words, CI provider markers, warning annotations, stage names, duration text, and organization-specific terms you add. It then separates the result into failure signals, a stage ledger, suggested triage actions, a stacked stage chart, and JSON. That shape is useful when a red job needs a first decision: rerun, open a test, inspect credentials, check runner health, trim a slow step, or hand a short evidence note to another team.

The page is a triage aid, not a CI platform connection or a proof of root cause. It does not fetch logs from GitHub Actions, GitLab CI, CircleCI, Jenkins, or a runner host. It reads the pasted text or selected local text file in the browser, applies deterministic text rules, and leaves the final decision to the person comparing the result with recent commits, job history, service status, and the raw log.

That local-first workflow still needs careful handling. The optional secret mask redacts token-like fragments in snippets and exported rows, but it does not clean the raw text you pasted. Treat copied rows, downloaded files, screenshots, and shared browser state as potentially sensitive whenever a build log contains credentials, internal hostnames, customer identifiers, or private branch names.

Technical Details:

The analysis begins by removing terminal color escapes, normalizing line endings, trimming trailing whitespace, and preserving the line order. Provider detection looks for common markers from GitHub Actions, GitLab CI, CircleCI, and Jenkins. You can leave the provider on automatic detection or force a provider profile when a copied excerpt has lost the markers that usually identify the CI system.

Stage detection runs beside provider detection. Group headings, command prompts, GitLab section markers, Jenkins Pipeline stage text, and plain command lines can all move the active stage. When no stage can be inferred, the line stays in an unclassified stage rather than being hidden. The built-in stage names cover checkout, dependencies, build, test, lint, container, artifact and cache, deploy, runner infrastructure, and unclassified work.

Failure classification is intentionally conservative. A line such as 0 failed, no errors, tests passed, or exit code 0 is treated as a success summary rather than a failure signal. Warnings are still kept as warnings, because warning annotations and deprecation messages can matter even when the final command succeeds.

Signal families used by the CI failure log analyzer
Signal family	Examples it looks for	Useful first check
Memory or exit 137	`OOMKilled`, `out of memory`, `exit code 137`, killed process messages.	Check runner memory, container limits, parallel test settings, and node pressure before changing assertions.
Timeout or canceled job	`timeout`, `timed out`, `context deadline exceeded`, canceled operation text.	Find the command active before the stop, then compare recent duration drift and external dependency health.
Credential or permission	`permission denied`, `unauthorized`, `forbidden`, invalid token, missing secret, access denied.	Confirm secret availability, branch or environment approval, token scope, and registry permissions.
Test, compile, dependency, lint	Failed test suites, assertions, syntax or type errors, missing modules, lockfile conflicts, analyzer violations.	Open the first file-level diagnostic and rerun the narrow command before retrying the whole job.
Network, artifact, deploy, runner	Connection resets, registry failures, missing artifacts, cache upload errors, deploy health checks, runner disk or pod failures.	Check the CI service, registry, artifact paths, target environment, and runner status before assuming a code defect.
Warning, slow step, custom term	Warning annotations, deprecations, parsed durations at or above the threshold, and terms entered in `Extra failure terms`.	Use these as review signals. They can explain a failure path, but they can also be background noise.

Duration parsing looks for text such as duration=102s, elapsed: 3 min, finished in 01:24, or took 1400 ms. Durations at or above the selected slow-step threshold become slow-step signals and feed the stacked stage chart. Setting the threshold to 0 surfaces every parsed duration.

Analyzer controls and result boundaries
Control or limit	Rule	What it changes
`Context lines`	0 to 4 neighboring lines around each signal.	Controls how much nearby evidence is copied into signal context and JSON.
`Maximum signals`	5 to 80 visible signal rows.	Caps the signal ledger for readability; the JSON still records the total signal count and whether visible signals were truncated.
`Mask secret-like values`	Redacts common token, password, key, authorization, GitHub token, and JWT-like fragments in snippets and contexts.	Reduces accidental sharing risk in exports, but it is not a substitute for reviewing logs before distribution.
`Pipeline label`	Optional text label.	Appears in export names or metadata so a copied report can stay tied to the right workflow, job, branch, or incident.
Export surfaces	Failure, stage, and action tables support CSV and DOCX; the chart supports PNG, WebP, JPEG, and CSV; JSON can be copied or downloaded.	Lets a triage note move into an issue, incident channel, pull request, or handoff document without rewriting the evidence.

Everyday Use & Decision Guide:

Start with one failed job, not a whole pipeline archive. A focused excerpt from the failing command and the lines immediately before it usually gives a cleaner result than thousands of successful setup lines. Leave the provider profile on Auto detect for a first pass, then force a profile only if the displayed provider badge looks wrong.

The first result to read is the summary box. A critical or failure label means at least one high-severity family matched. A warning or slow label means the log may still deserve review even if no direct failure line was found. No failure signal does not mean the job succeeded; it means the analyzer did not find one of its known patterns in the current text.

Use Failure Signals to jump to the highest-value line numbers, snippets, confidence labels, and failure classes.
Use Stage Ledger when the main question is which job phase produced the strongest signal.
Use Triage Actions to turn several similar signals into a shorter action queue.
Use CI Stage Signal Stack when you need a quick visual split of failures, warnings, and slow steps by stage.
Use JSON when another script, ticket template, or incident note needs the structured result.

Do not rerun a job just because the final line says exit code 1. Scroll upward to the first meaningful failure row, compare it with the affected stage, and only rerun immediately when the evidence points to a transient network, runner, or service problem.

Step-by-Step Guide:

Paste the failed job output into CI job log, drag a .log or .txt file onto the textarea, choose Browse LOG, or load the sample.
Use Normalize if copied terminal output contains color codes, mixed line endings, or trailing spaces.
Keep CI provider profile on Auto detect unless the provider badge is wrong or the pasted excerpt lacks provider markers.
Set Slow step threshold to the duration that deserves attention in this job. For many jobs, 60 to 300 seconds is a useful range.
Open Advanced if the result needs a pipeline label, custom failure words, more or less context, a smaller visible signal cap, or secret masking changes.
Read Failure Signals before Triage Actions. The action queue is easier to trust after you have seen the line numbers and snippets behind it.
Export only the evidence you need. CSV works for issue comments and spreadsheets, DOCX works for handoff notes, chart images work for summaries, and JSON works for automation.

A good handoff contains the affected stage, the first high-confidence line number, the failure class, a short snippet, and the next check. That is usually enough for the owner to reproduce or route the failure without reading the entire job log.

Interpreting Results:

The analyzer sorts signal rows by severity before line number, so the first row may not be the earliest clue. When a job has a long cascade, read the top severity rows and then inspect the earliest row in the same stage. A compiler failure, missing dependency, or failed test can produce many later exit-code messages that confirm the job failed without explaining why.

Severity reflects the matched signal family. Critical rows usually involve memory, timeout, credential, permission, or runner-health wording.
Stage is inferred from nearby headings and command text. It is helpful for routing, but copied excerpts can lose headings, so verify it against the raw job page.
Failure class names the matched family, including custom terms and parsed slow steps.
Confidence describes the detector confidence for that family. It does not measure business impact or certainty of root cause.
Stage action is a practical check for that CI phase. It is not a required runbook step.

Triage Actions groups signals by failure class and ranks them by severity and count. That makes it useful for noisy logs, but it can hide order. If the top action is Command exit code and a lower action points to a failed test, missing module, or permission error, the lower row may be the real starting point.

Slow-step rows should be compared with successful runs. A 90-second test suite might be normal for one repository and abnormal for another. Use the threshold as a filter, not as a universal performance rule.

Worked Examples:

Failed unit test after dependency setup

A GitHub Actions excerpt contains checkout, npm ci, and npm test. The final line says Process completed with exit code 1, but an earlier row says FAIL tests/payment/refund.spec.ts with Expected status 200, received 500. The analyzer places the test signal above the generic exit-code footer and routes it to the test stage. The useful next check is the first failing test and recent payment changes, not the final footer.

Registry failure during dependency install

A job stops in the dependency stage with ETIMEDOUT and a package-manager error. The network or registry family and dependency family may both appear. That combination points away from test debugging and toward registry status, proxy settings, cache state, and retry policy. If the same command passed on nearby runs, a targeted rerun may be reasonable after checking service health.

Runner issue hidden behind a red deploy job

A deploy job reports no space left on device before the release command finishes. The stage may show deploy or runner infrastructure depending on the surrounding lines, but the failure class still flags runner infrastructure. The better first move is checking runner disk and workspace cleanup, not changing deployment code.

FAQ:

Can it analyze logs from any CI provider?

It can analyze pasted plain-text logs from any provider, but provider-specific detection is strongest for GitHub Actions, GitLab CI, CircleCI, and Jenkins markers. Other systems fall back to generic shell-log behavior.

Does it run the failed command again?

No. It only reads text and classifies clues already present in the pasted or loaded log. Reproduction still belongs in your CI system, local environment, runner image, or service test setup.

Why did it miss a failure line?

The line may use wording outside the built-in patterns, or the pasted excerpt may omit the command output that explains the failure. Add a phrase to Extra failure terms for team-specific messages, then rerun the analysis.

Why did it flag a warning in a successful job?

Warnings and deprecations are review signals. They can explain future breakage or noisy logs even when the final command succeeds, so they are kept separate from direct failure signals.

Is secret masking enough before sharing a report?

No. Masking catches common token-like fragments in snippets and exports, but build logs can contain unusual secrets, internal paths, hostnames, customer data, and branch names. Review the exported evidence before posting it outside the build team.

Glossary:

CI job log: The text output from one automated job, including commands, annotations, warnings, errors, and final status lines.
Provider profile: The CI system grammar used for marker detection, such as GitHub Actions, GitLab CI, CircleCI, Jenkins, or generic shell output.
Failure signal: A line that matched a failure, warning, slow-step, or custom-term rule and kept its original line number.
Stage ledger: A summary of failure, warning, and slow-step counts grouped by inferred job stage.
Slow step: A parsed duration at or above the selected threshold.
Custom failure term: A phrase supplied by the user to catch organization-specific failure language.

References:

Workflow commands for GitHub Actions, GitHub Docs.
CI/CD job logs, GitLab Docs.
Configuration reference, CircleCI Docs.
Pipeline Syntax, Jenkins User Documentation.