3d1247a · 6,599 commits · 2,155 files
Issued 2026-10-03
Nothing significant. Questions worth asking about Engineering Process & SDLC Maturity.
104 checks ran across 6 assessable dimensions. None found a significant problem; 1 raised something worth a question. 4 findings, each with evidence. One dimension cannot be assessed without an acquirer.
- states a policy on AI-generated contributions .github/PULL_REQUEST_TEMPLATE.md:7
- names OpenSSF README.md:9
- 1 finding from checks Borehole's calibration found wrong more often than right is no longer published.
- 1 finding about one contributor is withheld: one author wrote nearly all of this repository's commits; a buyer of this report reads them.
| Dimension | Rating | ||
|---|---|---|---|
| 01 | Architecture & Codebase — including AI provenance | strong | |
| 02 | Engineering Process & SDLC Maturity | adequate | |
| 03 | Organization & Key-Person Risk | not assessable | |
| 04 | Product & Engineering Maturity | not assessable | |
| 05 | Security & Reliability Posture | strong | |
| 06 | Observability & Operations | not assessable | |
| 07 | Fit with the Acquirer | not assessable |
- 10% 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
- deep scan blamed 2,155 of 2,155 counted files
Architecture & Codebase — including AI provenance
01 · strong · ratings ↑src/main/java/io/reactivex/rxjava4/core/Observable.java is 14,845 lines, 131× this codebase's median file
adequateThe median source file here is 113 lines. 10 files exceed 1,130 lines, the largest being 14,845. Size is not a defect on its own — some problems genuinely live in one place — but these are where merge conflicts, review fatigue and single-owner knowledge concentrate, and they are the first thing that slows an inheriting engineer down.
A note that does not affect this rating: measured against its own codebase's median, it is below the 85th percentile of 382 surveyed projects' largest files, where this check begins to count.
| line-count | src/main/java/io/reactivex/rxjava4/core/Observable.java:1 — 14,845 lines (131× median) |
| line-count | src/main/java/io/reactivex/rxjava4/core/Maybe.java:1 — 5,698 lines (50× median) |
| line-count | src/main/java/io/reactivex/rxjava4/core/Single.java:1 — 5,227 lines (46× median) |
| line-count | src/main/java/io/reactivex/rxjava4/core/Completable.java:1 — 3,388 lines (29× median) |
| line-count | src/main/java/io/reactivex/rxjava4/parallel/ParallelFlowable.java:1 — 1,701 lines (15× median) |
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.
Engineering Process & SDLC Maturity
02 · adequate · ratings ↑11% of recent commits change more than 2,000 lines
adequate22 of 203 commits in the last 24 months changed over 2,000 lines of code, not counting reformatting, renames, vendored or generated code. A change that size is rarely reviewed line by line. Ask how they were reviewed, and what made them that large.
| git log --numstat | 22 commits over 2,000 lines |
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.
Tests are retried until they pass
adequate5 tests are individually marked to retry. A retry turns a flaky test green without saying why it failed, so a green build means the tests passed eventually. Ask how many retries a typical run needs, and which tests need them.
A note that does not affect this rating: notes like it are common in well-run projects.
| src/test/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableFromPublisherTest.java | src/test/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableFromPublisherTest.java:37 — test retry |
| src/test/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableTest.java | src/test/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableTest.java:76 — test retry |
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.
Organization & Key-Person Risk
03 · not assessable · ratings ↑Not rated: one author wrote nearly all of this repository's commits, so a finding about one contributor would be about someone its history all but names; the public report does not carry those, and does not rate this dimension without them. What a person adds here.
Product & Engineering Maturity
04 · not assessable · ratings ↑Not rated: only 9 of 19 checks could reach a conclusion here; the rest do not apply to this repository or could not read it. What a person adds here.
Security & Reliability Posture
05 · strong · ratings ↑2 advisories against this project in the last 24 months, 2 high or critical
adequateThe newest was published on 2026-08-05. A project that publishes advisories is telling its users about its fixes, and the count and pace say how much security work it carries. None of them affects the surveyed version.
A note that does not affect this rating: it describes the project's advisory record, and no advisory in it is known to affect the surveyed commit.
| GHSA-7mfh-h2cw-3p6c | 2026-08-05: GHSA-7mfh-h2cw-3p6c (high): RxJava TruffleHog Verified Secrets Exposed in Public CI Logs |
| GHSA-v6wc-p8jm-8pmx | 2026-08-05: GHSA-v6wc-p8jm-8pmx (high): RxJava Pwn Request Untrusted Code Execution via pull request target |
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 · not assessable · ratings ↑Not rated: only 5 of 16 checks could reach a conclusion here; the rest do not apply to this repository or could not read it. What a person adds here.
Fit with the Acquirer
07 · not assessable · ratings ↑Not rated: structurally not assessable from a repository. What a person adds here.
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- measured The tree carries design documentation (DESIGN.md). Does it match what the team believes today? Ask them to walk through it against the code.
- Is the architecture right for the next three years of the product?
- Were the home-grown components reasonable choices when they were made, and are they now?
Engineering Process & SDLC Maturity
02 · high coverage- Is review real or a rubber stamp? Comment depth and time to approve need the pull request history.
- Is delivery planned and measured, or heroic?
- How are incidents run, reviewed and learned from?
Organization & Key-Person Risk
03 · partial coverageNot rated: one author wrote nearly all of this repository's commits, so a finding about one contributor would be about someone its history all but names; the public report does not carry those, and does not rate this dimension without them.
- Which of the people who wrote this are part of the transaction, and for how long after it?
- Who mentors whom, and would that survive a departure?
- Can the team grow, and who stands behind the top three contributors?
- Is the seniority mix sound, and will pay survive your salary bands?
- Is the pace sustainable? Commit times cannot say: git keeps no reliable local time.
- Does the team want to stay after close?
- How are decisions made and disagreements resolved?
Product & Engineering Maturity
04 · minimal coverageNot rated: only 9 of 19 checks could reach a conclusion here; the rest do not apply to this repository or could not read it.
- measured 204 commits landed in the last year, against 13 the year before (+1469%). What drove it: new people, a deadline, or code produced faster than before?
- Can this team deliver the stated roadmap on the stated timeline?
- Does leadership know about the debt, and is time budgeted to repay it?
- Is the engineering shape consistent with the commercial story?
Security & Reliability Posture
05 · partial coverage- What has actually broken, how often, and how badly?
- What did external testing find, and was it fixed?
- What is the SOC 2, ISO 27001 or GDPR status, and where is the evidence?
Observability & Operations
06 · partial coverageNot rated: only 5 of 16 checks could reach a conclusion here; the rest do not apply to this repository or could not read it.
- Are the dashboards opened, the alerts acknowledged and the pages answered?
- Are the service-level objectives actually met?
- Who carries the pager, and how often does it go off?
- What does it cost to run, and how much headroom is there?
Fit with the Acquirer
07 · none coverageNot rated: structurally not assessable from a repository.
- This is primarily a Java codebase. Does your engineering organisation already run Java in production, or would this be the first?
- The bulk of this system sits in src/, gradle/, config/. Which of your existing systems would each of those have to absorb or replace?
- 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?
- 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?
- Which of these systems duplicate yours, and which get retired?
- What will integration cost, and in what order?
- Where does the team land in your organisation, and who reports to whom?
- Are there earn-outs, retention packages or contractor IP to assign?
- Do customer contracts limit hosting, regions or vendors?
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.
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.
Embed the badge
Tied to this commit and this date, and it fades after 90 days — an honest badge is one that expires. A repository with significant findings gets a neutral "read" badge rather than a red one: the library is where the range is visible, not someone else's README.
[](/r/reactivex/rxjava/3d1247a)If you embed it: link it to the report, remove it if the report is delisted, and do not present it as a certification or an endorsement.
Rejection log — 100 signals that ran and did not fire
Appendix: rejection log — 100 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 — 58
| Signal | What it found |
|---|---|
| 04.hotspot_concentration | change is spread across the codebase rather than pooling in a few filesfiles 14,670 · top5 share 0.031 |
| 04.debt_markers | debt markers are sparsemarkers 158 · per kloc 0.35 · lines read 454,485 |
| 04.test_growth | test effort kept pace with code writtenlate test per code 1.422 · early test per code 0.846 |
| 04.churn_trend | rework is not rising against new worklate delete per insert 0.717 · early delete per insert 0.664 |
| 04.fixes_with_tests | fixes usually come with a testfixes 49 · share 0.449 · with tests 22 |
| 06.telemetry_presence | this repository does not deploy a running service, so instrumentation is not expected of itbasis nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere · files read 2,143 |
| 06.structured_logging | not a running service; structured logging is not expected of a librarybasis nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere |
| 06.healthcheck_presence | not a running service, so a health endpoint is not expectedbasis nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere |
| 06.usage_reporting_default | the product's code names no reporting hostsettings on 0 · settings off 0 |
| 06.migrate_on_start | migrations do not run at container start |
| 03.active_contributors | withheld: this check's result would describe one person |
| 03.drive_by_contributors | withheld: this check's result would describe one person |
| 03.contributor_attrition | withheld: this check's result would describe one person |
| 03.critical_path_ownership | withheld: this check's result would describe one person |
| 03.second_contributor_attrition | withheld: this check's result would describe one person |
| 02.merge_discipline | a meaningful share of recent change carries evidence of reviewmerges 4 · window last 24 months · with tracked 1 |
| 02.ci_presence | CI configuration is present in the working treecount 12 |
| 02.test_presence | tests are present in a normal proportion to sourcetests 1,072 · source 2,074 · test ratio 0.517 |
| 02.release_cadence | tags are presenttags 308 |
| 02.conventional_commits | commit subjects generally carry contentsampled 5,229 · low content share 0.016 |
| 02.branch_protection_hints | process scaffolding is present in the repository |
| 02.ci_runs_tests | CI invokes a test runnerconfigs 12 · with tests 5 |
| 02.skipped_tests | few tests are switched offfocused 0 · skipped 19 · test files 1,073 |
| 02.ci_test_gating | no test run in CI is written so that it cannot failconfigs 12 |
| 02.revert_share | change is rarely undoneshare 0.0 · reverts 0 · recent commits 217 |
| 02.lint_in_build | a linter or formatter runs in the buildwired 1 · ci configs 12 · product files 1,002 |
| 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 933 · share of insertions 0.0008 |
| 01.message_uniformity | commit subjects vary in wording and lengthlength stdev 25.06 · repeat share 0.041 |
| 01.revision_depth | most files were revisited after they were first writtenfiles seen 719 · write once share 0.46 |
| 01.swallowed_errors | errors are rarely thrown awayloc 456,593 · 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 2,143 |
| 05.security_guardrails | at least one standard guard rail is configured |
| 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 989,071 |
| 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 44 · pipe to shell 0 · unpinned third party 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.license_grant_unclear | the licence is recognisable as Apache-2.0class permissive · license Apache-2.0 |
| 05.committed_native_libraries | no widely used compiled library is committed to the productlibraries 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.licence_changes | the root licence has not changed in the history readlicence versions 1 · unreleased changes 0 |
| 05.paid_edition | no directory carries a separate paid-edition licencedirectories 0 |
| 04.releases_stopped | releases keep pace with developmentmedian gap days 3.5 · days since last tag 53 · commits last 90 days 106 |
| 04.release_branch | the newest release was cut from the branch surveyedelsewhere 66 · on branch 216 · tags in window 282 |
| 03.single_maintainer | withheld: this check's result would describe one person |
| 05.project_advisories | no published advisory affects the surveyed versionaffecting 0 · exploited 0 · advisories 2 |
| 05.project_exploited | no affecting advisory is on CISA's Known Exploited listexploited 0 |
Could not conclude, or did not apply — 42
Not a clean result. Each says why it could not answer here.
| Signal | Why |
|---|---|
| 04.dependency_sprawl | no recognised dependency manifest found |
| 04.eol_runtime | no pinned runtime version to check |
| 04.fix_share_trend | fewer than six busy quarters to compare |
| 04.schema_churn | no schema migrations to read |
| 04.compat_layers | a library, whose compatibility code is usually deliberate |
| 04.dependency_redundancy | no JavaScript manifest to read |
| 06.telemetry_depth | not expected of it: nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere |
| 06.print_logging | not expected of it: nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere |
| 06.correlation_ids | not expected of it: nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere |
| 06.error_reporting | not expected of it: nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere |
| 06.alert_rules | not expected of it: nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere |
| 06.deployed_image_floats | not expected of it: nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere |
| 06.probes_identical | no Kubernetes probes |
| 06.single_replica | no Kubernetes deployments |
| 06.environment_branching | not expected of it: nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere |
| 06.release_markers | not expected of it: nothing in this repository deploys a long-running server; if it runs as one, its deployment lives elsewhere |
| 06.feature_flags | no feature-flag service; flags may live elsewhere |
| 03.knowledge_silos | withheld: this check's result would describe one person |
| 03.bus_factor_trend | withheld: this check's result would describe one person |
| 03.joiners_and_leavers | withheld: this check's result would describe one person |
| 02.dependency_update_cadence | no lockfile to date |
| 02.long_lived_branches | too few merges to judge (squash and rebase leave none) |
| 01.build_reproducibility | no product Dockerfile to read |
| 01.notebook_outputs | not a data or machine-learning repository |
| 05.dependency_pinning | no manifest whose pinning can be read without a lockfile |
| 05.container_runs_as_root | no Dockerfile to read |
| 05.outbound_timeouts | not a running service |
| 05.migration_reversibility | too few migrations to judge |
| 05.sql_from_strings | not a running service; a library that builds SQL is doing its job |
| 05.resource_limits | no Kubernetes workload manifests |
| 05.known_vulnerabilities | not assessed for Gradle: this survey does not read their dependency files |
| 05.public_env_secret | not a frontend |
| 05.unsafe_html | not a frontend |
| 05.source_maps_shipped | not a frontend |
| 05.cleartext_traffic | not a mobile app |
| 05.dataset_provenance | not a data or machine-learning repository |
| 05.license_copyleft_inherited | no 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_conflict | no packaging manifest states a licence |
| 04.flags_accumulating | few or no feature flags in the history |
| 04.api_versions_coexisting | not a running service |
| 04.deprecations_lingering | a library, which keeps deprecated interfaces for its users |
| 04.dependency_churn | few dependencies were added and dropped within 60 days |
Anyone can check this report against the authoritative record — click the stamp, or enter JP5Q-0N2W-QSF6 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
The image is wrapped in a link to the verification page, so a reader can check it rather than take it on trust. If you embed it: link it to the report, remove it if the report is delisted, and do not present it as a certification or an endorsement.
[](https://borehole.dev/verify/JP5Q0N2WQSF6?via=badge)
A survey is a reading by a particular version of the assessor. Older readings are kept rather than replaced, because a verification mark attests to the survey it was issued for — overwriting one would make every code already in circulation read as tampered.
| Read | Assessor | Findings | Band |
|---|---|---|---|
| 2026-10-03 · shown | borehole 0.7.12 | 6 | adequate |
7 other readings (show)
| 2026-10-04 | borehole 0.7.13 | 6 | adequate |
| 2026-10-03 | borehole 0.7.11 | 6 | adequate |
| 2026-10-02 | borehole 0.7.10 | 6 | adequate |
| 2026-10-01 | borehole 0.7.9 | 6 | adequate |
| 2026-09-30 | borehole 0.7.8 | 6 | adequate |
| 2026-09-29 | borehole 0.7.6 | 6 | adequate |
| 2026-09-29 | borehole 0.7.5 | 6 | adequate |
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.
| At | Step | Detail |
|---|---|---|
| 0.0s | read repository metadata from the GitHub API | authenticated: False |
| 33.5s | cloned the repository to a temporary directory | depth: full |
| 43.4s | read the git history | commits: 6599tracked files: 2155 |
| 262.7s | ran the deterministic checks | blame pass: Trueread working tree: False |
| 262.7s | recorded where this scan ran | attested: Falseenvironment: cloud-run |
| 332.8s | kept the facts, never the source, for re-reading under new checks | |
| 332.8s | deleting the working copy |
Total 332.8s ·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).