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sigmahq/sigma
Free reading: not for reliance
Borehole badge for sigmahq/sigma
05d1031 · 16,932 commits · 5,591 files
Issued 2026-10-23

Nothing significant. Questions worth asking about Observability & Operations, Security & Reliability Posture.

105 checks ran across 6 assessable dimensions. None found a significant problem; 3 raised something worth a question. 9 findings, each with evidence. One dimension cannot be assessed without an acquirer.

What the repository says about itself
  • 05.60 Relicensed: GPL-3.0 → LGPL-3.0 (2021-10-23) LICENSE
Published under today's rules. The verification code attests to this reading as it was stored. This page differs from it as follows.
  • Words about people are today's: bands rather than exact shares, dates or day counts, and what the history measured rather than why.
  • 1 finding from checks Borehole's calibration found wrong more often than right is no longer published.
strong adequate significant findings not assessable from a repository
Provenance disclosure does not affect any rating
0% of added lines arrived in commits declaring an AI agent as co-author
The surviving-lines measurement was not run on this repository.
0% of lines added in the last 12 months (since 2025-10-23) arrived in AI-declared commits: 3/313 commits, confidence high. Also a floor.
3/12,938 commits declaring an agent · Copilot
confidence: moderate
  • 11% of non-merge commits carry any trailer at all
  • low trailer coverage: the convention may not be in consistent use
  • no widespread author/committer date divergence
4,217 lines excluded as lockfiles, vendored or generated.
This is a lower bound. It counts what the repository declares. Undeclared AI authorship is invisible here, and a single rebase removes the trailers this rests on. Absence of a declaration is absence of disclosure, not absence of AI authorship.

Architecture & Codebase — including AI provenance

01 · strong · ratings ↑

No finding. 11 checks ran and none fired; the rejection log below says why each did not.

Engineering Process & SDLC Maturity

02 · strong · ratings ↑

No finding. 16 checks ran and none fired; the rejection log below says why each did not.

Organization & Key-Person Risk

03 · strong · ratings ↑

No finding. 10 checks ran and none fired; the rejection log below says why each did not.

Product & Engineering Maturity

04 · adequate · ratings ↑
04.19

8% of bug fixes add or change a test

adequate

Of 121 fixes in the last 24 months, 10 touched a test. A fix without the test that would have caught the bug can quietly come back, and the suite never learns from what went wrong.

Evidence
fix commits touching tests 10 of 121
Respond to this finding

Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.

An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.

A note that does not affect this rating
04.5

Effort is shifting from building to rewriting

adequate

Deleted lines per line added rose from 4.20 to 26.11 between the first and second halves of this history. Rework is normal and often healthy, but a rising ratio means an increasing share of the team's time is spent replacing code that already exists rather than building what does not. Whether that is deliberate repayment or churn is a question for the team.

A note that does not affect this rating: in Borehole's calibration, this check's notes were usually true but overstated.

Evidence
deletions-per-insertion first half 4.20, second half 26.11 (split 2021-11-22)
Respond to this finding

Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.

An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.

Security & Reliability Posture

05 · adequate · ratings ↑
05.2

None of the standard security guard rails are configured

adequate

There is no disclosure policy, no automated dependency updates, no named code owners and no pre-commit configuration. None of these is load-bearing on its own. Their collective absence says that security posture here is whatever the current team happens to remember to do, which is not a posture that survives the team changing.

Evidence
guardrail-scan checked 5 kinds of guard rail across 5,591 tracked files; 0 present
Respond to this finding

Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.

An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.

05.10

Licence text does not match a standard licence

adequate

LICENSE exists but its text does not match any standard licence. A bespoke or hand-edited licence is not wrong, but it cannot be cleared by recognising its name: counsel has to read it, and until they do neither side knows precisely what rights transfer with the code.

Evidence
LICENSE LICENSE:1 — 6 lines, unrecognised
Respond to this finding

Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.

An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.

A note that does not affect this rating
05.60

Relicensed: GPL-3.0 → LGPL-3.0 (2021-10-23)

adequate

The root licence changed 1 time(s). Code taken under earlier terms stays under them; check which terms any fork or customer relied on.

A note that does not affect this rating: a licence change is a fact for the first screen, and only a narrowing of rights within two years of the surveyed commit costs "strong".

Evidence
5d687e5a2 LICENSE — GPL-3.0 from 2016-12-24
a712a0d14 LICENSE — LGPL-3.0 from 2021-10-23
Respond to this finding

Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.

An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.

Observability & Operations

06 · adequate · ratings ↑
06.1

No telemetry or error reporting is wired in anywhere

adequate

None of 5,094 readable files references an instrumentation, metrics or error-reporting library. If this system is in production, nobody learns that it broke from the system itself — they learn it from a customer. That is a reliability finding before it is an observability one.

Evidence
telemetry-scan searched 5,094 tracked text files for 16 known instrumentation libraries; manifests for metrics, tracing and error-reporting families; locked dependencies for the packages that emit; 0 matched
Respond to this finding

Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.

An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.

06.2

No structured logging library is in use

adequate

Nothing references a structured logging library. Logs that are written to be read by a person are not searchable by a machine, which means incident response here is proportional to how well someone remembers the codebase rather than to what the tooling can find.

Evidence
logging-scan searched 5,094 files for 10 structured logging libraries; 0 matched
Respond to this finding

Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.

An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.

06.8

One request cannot be followed through the logs

adequate

Nothing in the service carries a request or correlation id, and there is no tracing. When a customer reports a failure, the log lines that belong to their request cannot be picked out from everyone else's.

Evidence
request ids no request id, correlation id or tracing found
Respond to this finding

Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.

An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.

A note that does not affect this rating
06.9

No error reporter is wired in

adequate

Nothing in the service initialises an error reporter (Sentry, Rollbar, Bugsnag, Honeybadger or an APM agent). An exception in production reaches a person only if someone is reading the logs, which usually means a customer reports it first.

A note that does not affect this rating: notes like it are common in well-run projects.

Evidence
error reporting no error reporter initialised
Respond to this finding

Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.

An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.

Fit with the Acquirer

07 · not assessable · ratings ↑

Not rated: structurally not assessable from a repository. What a person adds here.

Check it on the running system

6 checks against the running system follow from the findings above: what a buyer's engineer will try, how to run it first, and what to have ready. A paid survey of this repository includes them. See the tiers.

A paid survey of a public repository is also reviewed: a language model reads each finding against the code and withdraws only findings it judges the code contradicts, each listed with its reason. The review is a language model's reading of the findings against the code, and it can be wrong. It never adds a finding, never raises a band, and never removes a finding from a proven check or an advisory that affects the surveyed version.

What a person adds

The survey reads what the repository can show. The code cannot settle these questions, and on them this report states nothing. Each says where its answer lives: your own engineer, the company, or an assessor you choose can settle it. Questions marked measured open with something this repository shows.

Architecture & Codebase — including AI provenance

01 · full coverage
  1. measured No architecture or design document is in the tree, across 5,545 product files. Where does the design live, and who holds it? Answer lives in: The team01.38
  2. Is the architecture right for the next three years of the product? Answer lives in: Your architects, with the product roadmap01.39
  3. Were the home-grown components reasonable choices when they were made, and are they now? Answer lives in: The team's reasoning at the time01.40

Engineering Process & SDLC Maturity

02 · high coverage
  1. Is review real or a rubber stamp? Comment depth and time to approve need the pull request history. Answer lives in: The code host's pull request data02.32
  2. Is delivery planned and measured, or heroic? Answer lives in: The issue tracker: backlog, sprint history, estimate accuracy02.38
  3. How are incidents run, reviewed and learned from? Answer lives in: Tickets, chat and postmortems02.37

Organization & Key-Person Risk

03 · partial coverage
  1. measured 691 people have committed here. Which of them are you acquiring, and which are you replacing? Answer lives in: The deal terms03.29
  2. measured unsupported/ (less than a quarter of the files) has not changed in 18 months while the rest of the repository moved. Is that code finished, or abandoned, and who still knows how it works? Answer lives in: The team03.22
  3. Who mentors whom, and would that survive a departure? Answer lives in: The team; review history only suggests candidates03.28
  4. Can the team grow, and who stands behind the top three contributors? Answer lives in: Recruiting data and the org chart03.30
  5. Is the seniority mix sound, and will pay survive your salary bands? Answer lives in: HR data03.31
  6. Is the pace sustainable? Commit times cannot say: git keeps no reliable local time. Answer lives in: Interviews and on-call history03.14
  7. Does the team want to stay after close? Answer lives in: Interviews03.32
  8. How are decisions made and disagreements resolved? Answer lives in: Time with the team03.33

Product & Engineering Maturity

04 · minimal coverage
  1. Can this team deliver the stated roadmap on the stated timeline? Answer lives in: The data room and the team's record of estimates04.32
  2. Does leadership know about the debt, and is time budgeted to repay it? Answer lives in: Budget and roadmap decisions04.31
  3. Is the engineering shape consistent with the commercial story? Answer lives in: Revenue, customer and churn data04.33

Security & Reliability Posture

05 · partial coverage
  1. measured No threat model is in the tree of what looks like a running service. Does one exist elsewhere, and who owns it? Answer lives in: The security owner05.43
  2. What has actually broken, how often, and how badly? Answer lives in: Ticketing and chat05.41
  3. What did external testing find, and was it fixed? Answer lives in: Reports in the data room05.42
  4. What is the SOC 2, ISO 27001 or GDPR status, and where is the evidence? Answer lives in: Audit reports; policy files in the tree are not evidence05.44

Observability & Operations

06 · partial coverage
  1. measured Backup or restore tooling is in the tree (rules/cloud/aws/cloudtrail/aws_rds_public_db_restore.yml). Has a restore ever been rehearsed, and how long did it take? Answer lives in: The operations team06.19
  2. measured No alert rule is defined in the repository. Where are alerts defined, who receives them, and when did one last fire? Answer lives in: The alerting tool and the on-call rota06.10
  3. Are the dashboards opened, the alerts acknowledged and the pages answered? Answer lives in: Pager history and dashboard logs06.29
  4. Are the service-level objectives actually met? Answer lives in: Production metrics06.30
  5. Who carries the pager, and how often does it go off? Answer lives in: Pager exports and interviews06.31
  6. What does it cost to run, and how much headroom is there? Answer lives in: Cloud billing and capacity plans06.32

Fit with the Acquirer

07 · none coverage

Not rated: structurally not assessable from a repository.

  1. The bulk of this system sits in rules/, regression_data/, other/. Which of your existing systems would each of those have to absorb or replace? 07.10
  2. Nothing in the repository says how this is deployed. Is it shipped as a library, a binary or a service, and if it runs somewhere, who owns that environment? 07.2
  3. What is your tolerance for the findings above remaining unaddressed for the first two quarters after close, given everything else that will compete for this team's time?
  4. Which of these systems duplicate yours, and which get retired? Answer lives in: Your architecture07.11
  5. What will integration cost, and in what order? Answer lives in: The engagement07.12
  6. Where does the team land in your organisation, and who reports to whom? Answer lives in: Your org design07.13
  7. Are there earn-outs, retention packages or contractor IP to assign? Answer lives in: Deal terms07.14
  8. Do customer contracts limit hosting, regions or vendors? Answer lives in: Customer contracts07.15

A human assessment is Borehole's own paid service, €12,000+ (total price is determined per engagement; travel billed at cost). It is not independent of this report: the same business produced both. It is a separate contract, with its own scope, terms and reliance.

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Rejection log — 96 signals that ran and did not fire

Appendix: rejection log — 96 signals that ran and did not fire

Published on purpose. A signal that looked and decided not to fire has told you something, and this is the calibration data behind every threshold above.

Looked, and found nothing — 57

SignalWhat it found
04.hotspot_concentration change is spread across the codebase rather than pooling in a few filesfiles 17,473 · top5 share 0.012
04.debt_markers debt markers are sparsemarkers 35 · per kloc 0.16 · lines read 222,587
04.test_growth test effort kept pace with code writtenlate test per code 1.96 · early test per code 0.121
04.fix_share_trend fixing is not crowding out building
06.healthcheck_presence a health or readiness check is defined
06.print_logging raw prints are few, or outnumbered by logger callsprints 0 · logger calls 0
06.usage_reporting_default the product's code names no reporting hostsettings on 0 · settings off 0
06.environment_branching environment differences live in configurationsites 0
06.release_markers releases are markedtags last year 5 · release commits 0 · changelog commits 3
06.migrate_on_start migrations do not run at container start
03.contributor_concentration no single contributor dominates the last 24 monthsyears 9.8 · window last 24 months · authors 691
03.active_contributors more than one contributor active in the trailing yearall time 691 · active 12mo 98
03.drive_by_contributors an open contributor base, where one-commit contributors are normalauthors 691 · one off share 0.405
03.contributor_attrition no contributor dominates enough for their absence to matterauthors 691 · top share less than a quarter · top contributor last committed within the last three months
03.critical_path_ownership more than one person changes the critical pathsauthors 156
03.second_contributor_attrition the second and third contributors are still active
03.bus_factor_trend the team has not narrowed to one person
03.joiners_and_leavers the team is not shrinkingleft 6 · joined 6 · regular last year 15
02.merge_discipline a meaningful share of recent change carries evidence of reviewmerges 4 · window last 24 months · with tracked 0
02.ci_presence CI configuration is present in the working treecount 13
02.release_cadence tags are presenttags 58
02.conventional_commits commit subjects generally carry contentsampled 12,938 · low content share 0.043
02.branch_protection_hints process scaffolding is present in the repository
02.skipped_tests few tests are switched offfocused 0 · skipped 0 · test files 14
02.ci_test_gating no test run in CI is written so that it cannot failconfigs 13
02.revert_share change is rarely undoneshare 0.0 · reverts 0 · recent commits 565
02.flaky_test_markers tests are not retried until they passtest retries 0 · suite retries 0
01.burst_import no commit run met both the rate and the net-addition thresholdgap seconds 180 · min add ratio 3.0 · min net added 2,000
01.initial_dump first commit is not a disproportionate share of the codebaseinsertions 765 · share of insertions 0.0013
01.message_uniformity commit subjects vary in wording and lengthlength stdev 24.46 · repeat share 0.262
01.revision_depth most files were revisited after they were first writtenfiles seen 4,908 · write once share 0.207
01.swallowed_errors errors are rarely thrown awayloc 227,642 · files 0 · per kloc 0.0
01.unfinished_migration no language migration is stalled halfway
01.weights_in_git no model weights are committedfiles 0
05.committed_secrets no credential-shaped strings outside test and fixture pathsnote the working tree only; the history is 05.5 · patterns 8 · files read 5,094
05.license_present a licence file is presentfound True
05.secrets_in_history no credential-shaped string was ever added outside test and fixture pathspatterns 8 · truncated False · added lines 557,071
05.secrets_management_pattern no environment file is committed outside tests and examplesenv files 0
05.supply_chain_pinning third-party build steps are pinned, or fewaction refs 36 · pipe to shell 0 · unpinned third party 1
05.outbound_timeouts outbound calls set timeouts, or are fewcalls without timeout 0
05.sql_from_strings no SQL is assembled from strings in product codefiles 0 · sites 0 · value interpolated 0
05.shell_from_strings product code does not build shell commands from stringssites 0
05.unsafe_deserialization no code-executing deserialiser in product codesites 0
05.tls_verification_off no TLS verification is switched off in product codefiles 0 · sites 0 · pinned instead 0
05.privileged_workloads no workload runs privileged or in the host's namespacessites 0 · behind a setting or built here 0
05.credentials_in_deploy_config deployment configuration references secrets, never holds themfiles 0 · sites 0
05.signing_material no signing keystore or profile is committedfiles 0
05.license_vendored_unlicensed no vendored third-party code is committedcomponents 0
05.committed_native_libraries no widely used compiled library is committed to the productlibraries 0
04.dependency_churn few dependencies were added and dropped within 60 daysdependencies seen 17 · added in two years 0 · removed within 60 days 0
04.ci_platforms_dropped no platform was dropped from CI in the last two years
04.repository_status the README's first screen states no end, move or freezestatements 0
02.development_elsewhere nothing says development happens elsewhereno pr statements 0 · mirror statements 0 · replayed commit share 0.0
05.paid_edition no directory carries a separate paid-edition licencedirectories 0
04.releases_stopped releases keep pace with developmentmedian gap days 55.0 · days since last tag 106 · commits last 90 days 87
04.release_branch the newest release was cut from the branch surveyedelsewhere 0 · on branch 30 · tags in window 30
03.single_maintainer no file says one person maintains itstatements 0

Could not conclude, or did not apply — 39

Not a clean result. Each says why it could not answer here.

SignalWhy
04.dependency_sprawlno recognised dependency manifest found
04.eol_runtimeno pinned runtime version to check
04.schema_churnno schema migrations to read
04.compat_layerstoo little code
04.dependency_redundancyno JavaScript manifest to read
06.telemetry_depthnone at all is 06.1
06.alert_rulesno alert rules in the repository; they may live in a console
06.deployed_image_floatsno deployment descriptor names an image
06.probes_identicalno Kubernetes probes
06.single_replicano Kubernetes deployments
06.feature_flagsno feature-flag service; flags may live elsewhere
03.knowledge_silostoo few substantial top-level directories to read ownership
02.test_presencetoo few source files to judge test proportion
02.dependency_update_cadenceno lockfile to date
02.lint_in_buildtoo small, or no CI to wire a linter into (02.2)
02.long_lived_branchestoo few merges to judge (squash and rebase leave none)
02.commit_sizetoo few recent commits
01.oversized_modulestoo few source files to establish a norm to compare against
01.duplicated_blockstoo few source files to look for duplication across them
01.build_reproducibilityno product Dockerfile to read
01.notebook_outputsnot a data or machine-learning repository
05.dependency_pinningno manifest whose pinning can be read without a lockfile
05.container_runs_as_rootno Dockerfile to read
05.migration_reversibilitytoo few migrations to judge
05.resource_limitsno Kubernetes workload manifests
05.known_vulnerabilitiesno lockfile this survey can read, or a collector older than 0.4.0
05.public_env_secretnot a frontend
05.unsafe_htmlnot a frontend
05.source_maps_shippednot a frontend
05.cleartext_trafficnot a mobile app
05.dataset_provenancenot a data or machine-learning repository
05.license_copyleft_inheritedno third-party code is committed to this repository, so the licences it depends on are resolved at build time and are not readable here
05.license_manifest_conflictno packaging manifest states a licence
04.flags_accumulatingfew or no feature flags in the history
04.api_versions_coexistingone API version is served, or none
04.deprecations_lingeringfew deprecations have outlived two years
05.project_advisoriesrecord incomplete: no advisory found in the sources that answered; NVD: 11 records name sigma with nothing tying them to this repository (CVE-2005-1639, CVE-2014-5431, CVE-2014-5432, …)
05.advisory_recordrecord incomplete: no advisory against the project in the last 24 months; NVD: 11 records name sigma with nothing tying them to this repository (CVE-2005-1639, CVE-2014-5431, CVE-2014-5432, …)
05.project_exploitedno affecting advisory is on CISA's Known Exploited list
BOREHOLE READING NOT A CERTIFICATION B21F-M8W8-S27P 2026-10-23 · 05D1031 BOREHOLE.DEV/VERIFY

Anyone can check this report against the authoritative record — click the stamp, or enter B21F-M8W8-S27P at borehole.dev/verify.

The code commits to the 106 checks this run performed, the bands they produced, and the commit they were read at. It does not cover checks written since.

Put the mark in your README

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[![Borehole reading, not a certification](https://borehole.dev/badge/sigmahq/sigma/05d1031.svg "Borehole free reading: not for reliance. See the full report.")](https://borehole.dev/verify/B21FM8W8S27P?via=badge)

Borehole reading B21F-M8W8-S27P, not a certification

Where this scan ran

This scan ran on ordinary cloud infrastructure (cloud-run), not in a hardware-isolated confidential VM. Nothing about it is attested by Google.

What an attested survey proves, and what it does not.

What this scan did with the repository — 7 steps

Written by the steps themselves as they ran, not described afterwards. A hand-written account of a data flow drifts the first time somebody changes the flow and not the account.

AtStepDetail
0.0s read repository metadata from the GitHub API size mb: 48.4authenticated: False
7.5s cloned the repository to a temporary directory depth: full
13.5s read the git history commits: 16932tracked files: 5591
63.9s ran the deterministic checks blame pass: Falseread working tree: False
63.9s recorded where this scan ran attested: Falseenvironment: cloud-run
97.3s kept the facts, never the source, for re-reading under new checks
97.3s deleting the working copy

Total 97.3s ·source content sent off this machine: none · calls to a language model: 0 · the clone was deleted when the survey ended

An automated reading of a repository's code and its history up to one commit, with public advisory records. It may be wrong, it is not legal, financial, investment or security advice, and it does not replace diligence by a qualified person. It is provided for information: nobody may rely on it (Borehole's terms, section 3).

BOREHOLE 0.7.15 DETERMINISTIC LAYER · NO MODEL CALLSREAD ON BOREHOLE'S SERVER · CLONE DELETED TAKEDOWNCONTRIBUTED TO THIS REPOSITORY? YOUR RIGHTS