Public record
Software health reportschema 0.34.0 · metrics 2.10.0 · 2026-08-28 06:05 UTC

reactor / reactor-core

Non-Blocking Reactive Foundation for the JVM

JavaApache-2.0★ 5,235 stars⑂ 1,254 forkssince Nov 2015View on GitHub ↗

reactor/reactor-core holds a health index of 96 out of 100, placing it in the Exceptional band. It scores highest on Community & Adoption (95/100) and lowest on AI Readiness (67/100). It was last updated today. 2 contributors account for most of its recent work.

96
overall / 100
Exceptional

Software health index

Metrics are grouped into weighted categories on one standardized 1–100 scale. Overall starts as their weighted mean, calibrated against the distribution of the public record so bands carry percentile meaning; when public evidence triggers the High-Risk Jurisdiction Policy, the rating is adjusted and receives an At Risk ceiling of 34.

96
Exceptional93-100The record's top tier (≈ top 5%); essentially all checked criteria met
Excellent80-92Strong across the board; minor gaps
Good65-79Healthy; gaps are limited and manageable
Moderate50-64Acceptable with notable gaps; review recommended
Weak35-49Material weaknesses across several areas
At Risk20-34Significant weaknesses; adoption warrants caution
Critical1-19Severe problems (abandoned, single-maintainer, no hygiene)
VitalityCommunity &AdoptionSustainability &GovernanceEngineeringQualitySecurityAI Readiness

Score profile

Each axis is a category. The shape matters more than the average — a healthy subject fills the whole shape, while a spike-and-crater profile means strength in one dimension is masking risk in another.

The weighted overall 83 is calibrated to 96 on the published index scale (record calibration 2026-08-02).

Ownership

ReactorOrganization · verified domain
561 followers14 public repossince Apr 2013

This repository is backed by an organization — shared, accountable stewardship that can outlive any single maintainer.

Metrics by category

Vitality

Is the project alive — is code being written and are releases shipping?

90Excellent · 21% of overall
How it's scored
36/36Push recencylast push 0 days ago
19.4/36Commit cadence28/52 weeks with commits
18/18Commit volume270 commits in the last year
10/10OpenSSF Scorecard: Maintained30 commit(s) and 8 issue activity found in the last 90 days -- score normalized to 10
Inputs used
commits_last_year270
human_commit_share0.49
days_since_last_push0
active_weeks_last_year28

Release discipline

100Exceptional
How it's scored
27/27Ships releases100 releases published
36/36Release recencylatest release 4 days ago
27/27Release cadencea release every ~24.7 days
0/10OpenSSF Scorecard: Signed-Releasesno data
Inputs used
releases_count100
latest_release_tagv3.8.7
releases_from_tagsno
days_since_latest_release4
mean_days_between_releases24.7
Excluded from scoring (no data or not applicable): OpenSSF Scorecard: Signed-Releases. Remaining weights renormalized.

Community & Adoption

Does the project have users, downloads, attention, and a welcoming setup for contributors?

95Exceptional · 17% of overall
How it's scored
60/60Stars5,235 stars
25/25Forks1,254 forks
12.4/15Watchers171 watchers
Inputs used
forks1,254
stars5,235
watchers171
growth_stateunverified
growth_factor_pct100
growth_unverified_reasonno_history

Community health

92Excellent
How it's scored
22.5/22.5README
22.5/22.5Licenserecognized license (Apache-2.0)
18/18CONTRIBUTING guide
13.5/13.5Code of conduct
0/7.2Issue template
6.3/6.3PR template
Inputs used
has_readmeyes
has_licenseyes
readme_badges3
has_contributingyes
has_issue_templateno
has_code_of_conductyes
readme_badge_servicesgithub.com, shields.io
has_pull_request_templateyes

Sustainability & Governance

Will the project survive its people — bus factor, responsiveness, who backs it, and package upkeep?

74Good · 23% of overall
How it's scored
25.2/54Bus factor2 contributor(s) cover half of all commits
13/22.5Commit distributiontop contributor authored 42% of commits
13.5/13.5Contributor breadth98 contributors
10/10OpenSSF Scorecard: Contributorsproject has 34 contributing companies or organizations
Inputs used
bus_factor2
contributors_sampled98
top_contributor_share0.421
How it's scored
40.4/42Issue resolution96% of issues closed
22.7/30PR acceptance1,836/2,430 decided PRs merged
0/13Newcomer PR acceptanceno first-time contributor's PR decided in 30d
0/15OpenSSF Scorecard: Code-ReviewFound 0/6 approved changesets -- score normalized to 0
Inputs used
merged_prs1,836
open_issues71
closed_issues1,806
prs_merged_7d0
prs_decided_7d0
prs_merged_30d0
prs_decided_30d0
issue_closed_ratio0.962
closed_unmerged_prs594
first_time_authors_30d0
first_time_prs_merged_30d0
first_time_prs_decided_30d0
Excluded from scoring (no data or not applicable): Newcomer PR acceptance. Remaining weights renormalized.
How it's scored
30/30Ownership backingorganization-owned
20/20Verified domain
19.8/25Owner reach561 followers of reactor
20.6/25Track record14 public repos, account ~13 yr old
Inputs used
followers561
owner_typeOrganization
is_verifiedyes
owner_loginreactor
public_repos14
account_age_days4,878

Engineering Quality

Are baseline engineering and documentation practices in place?

81Excellent · 19% of overall
How it's scored
24/24CI workflows6 workflow(s)
24/24Tests present
0/16Linter config
0/9.6Pre-commit hooks
0/6.4.editorconfig
20/20OpenSSF Scorecard: CI-Tests24 out of 24 merged PRs checked by a CI test -- score normalized to 10
Inputs used
has_ciyes
has_testsyes
has_editorconfigno
has_linter_configno
has_precommit_configno

Documentation

100Exceptional
How it's scored
30/30README
25/25Documentation directory
15/15Documentation / homepage sitehttp://projectreactor.io
10/10Repository description
10/10Topics8 topics
10/10Wiki
Inputs used
topicsreactive, flux, mono, reactive-streams, flow, asynchronous, reactive-extensions, jvm
has_wikiyes
homepagehttp://projectreactor.io
docs_sitehttp://projectreactor.io
has_readmeyes
has_docs_diryes
has_descriptionyes

Security

Are visible security and supply-chain practices strong, without unresolved high-risk jurisdiction exposure?

79Good · 16% of overall
How it's scored
7.5/7.5Binary-Artifactsno binaries found in the repo
4.5/7.5Branch-Protectionbranch protection is not maximal on development and all release branches
2.5/2.5CI-Tests24 out of 24 merged PRs checked by a CI test -- score normalized to 10
0/2.5CII-Best-Practicesno effort to earn an OpenSSF best practices badge detected
0/7.5Code-ReviewFound 0/6 approved changesets -- score normalized to 0
2.5/2.5Contributorsproject has 34 contributing companies or organizations
10/10Dangerous-Workflowno dangerous workflow patterns detected
7.5/7.5Dependency-Update-Toolupdate tool detected
0/5Fuzzingproject is not fuzzed
2.5/2.5Licenselicense file detected
7.5/7.5Maintained30 commit(s) and 8 issue activity found in the last 90 days -- score normalized to 10
5/5Packagingpackaging workflow detected
4.5/5Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 9
5/5SASTSAST tool is run on all commits
5/5Security-Policysecurity policy file detected
0/7.5Signed-Releasesno data
7.5/7.5Token-PermissionsGitHub workflow tokens follow principle of least privilege
0.8/7.5Vulnerabilities9 existing vulnerabilities detected
Inputs used
sourceopenssf_scorecard
checks_evaluated17
scorecard_versionv5.5.0
checks_inconclusive1
scorecard_aggregate7.4
Excluded from scoring (no data or not applicable): Signed-Releases. Remaining weights renormalized.

Dependency advisories

100Exceptional
How it's scored
35/35Direct dependencies free of known advisoriesno direct dependency carries a known advisory
0/25Indirect dependencies free of known advisoriestransitive set not separable from development and test dependencies in this scope
0/40No advisories left outstandingno advisory carries a publication date
Inputs used
sourceosv
advisories11
affected_packages4
assessed_packages235
unassessed_packages0
affected_by_severitycritical 1, high 3
direct_affected_packages0
Excluded from scoring (no data or not applicable): Indirect dependencies free of known advisories, No advisories left outstanding. Remaining weights renormalized. Matched 235 resolved dependencies against OSV. This repository publishes no package the index resolves, so the repository dependency graph was assessed instead. That graph mixes development and test pins with shipped dependencies, so only the declared runtime dependencies are scored; transitive findings are reported as context and excluded from the score. Reachability is not analyzed.

AI Readiness

How well is the repo equipped to be developed and maintained with AI coding agents? Carries a deliberately small weight (4%): agent tooling is a real maintenance signal, but a repository with none can still reach 100/100.

67Good · 4% of overall
How it's scored
0/45Agent instructionsno CLAUDE.md / AGENTS.md / editor rules
15/15Machine-readable docs (llms.txt)llms.txt served by the project website (https://docs.gradle.org/llms.txt)
28.3/40Legible commit history26 of 49 human commits state their intent (structured subject or explanatory body)
Inputs used
has_llms_txtyes
llms_txt_urlhttps://docs.gradle.org/llms.txt
legible_history_share0.531
agent_instruction_files
agent_instruction_max_bytes
How it's scored
12.6/18One-command bootstrapbenchmarks/build.gradle, build.gradle, buildSrc/build.gradle (toolchain convention, no task runner)
22/22Automated tests
0/11Lint / format config
11/11Static type checkingJava (statically typed)
10/10Reproducible environmentlockfile
0/10Demonstrated agent practiceno agent-authored commits among the last 100
8/8Automated maintenance51 of the last 100 commits are automated dependency updates
9/10OpenSSF Scorecard: Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 9
Inputs used
has_nixno
has_testsyes
lockfilespackage-lock.json
has_dockerfileno
typed_languageyes
bootstrap_files
has_devcontainerno
has_linter_configno
typecheck_configs
agent_commit_share0
toolchain_manifestsbenchmarks/build.gradle, build.gradle, buildSrc/build.gradle, docs/build.gradle, reactor-core-micrometer/build.gradle, reactor-core/build.gradle, reactor-test/build.gradle, reactor-tools/build.gradle, reactor-tools/src/buildPluginTest/resources/mock-gradle/build.gradle
dependency_bot_commit_share0.51
How it's scored
45/45Type-checkable codeJava (statically typed)
54.5/55Manageable file sizes10/1,005 source files over 60KB
Inputs used
primary_languageJava
largest_source_bytes509,150
source_files_sampled1,005
oversized_source_files10

Key facts

5,235GitHub stars
98contributors
270commits, last 12 months
0days since last push
100releases
2bus factor
71open issues
Maven, npmpackage ecosystems

Data collection warnings

  • Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token

More detail

Star and fork history 0 ★ / 1,254 ⇿
0Stars
1,254Forks
99Releases

When each star and fork was added, collected from GitHub and bucketed by day. Cumulative growth sits directly above the daily additions it is made of, so the two read against each other: steady organic accretion looks nothing like an abrupt, short-lived burst. Where that difference is measurable, it is reported as growth authenticity.

Only the most recent history is shown — this repository exceeds the collection window, so the earliest history is not captured.

2004006008001,0001,2001,4001,254112017-122022-042026-08
Major 0Minor 3Patch 77

Each point covers 8 days.

OpenSSF Scorecard 7.4 / 10
7.4aggregate

Independent, tool-agnostic security assessment from the open-source OpenSSF Scorecard. Each check rewards a security practice, not a specific vendor's tool. Checks Scorecard could not determine are marked n/a and excluded from the security score (never counted as zero).Scorecard v5.5.0 · 2026-08-28 06:04 UTC

10Binary-Artifactsno binaries found in the repo
6Branch-Protectionbranch protection is not maximal on development and all release branches
10CI-Tests24 out of 24 merged PRs checked by a CI test -- score normalized to 10
0CII-Best-Practicesno effort to earn an OpenSSF best practices badge detected
0Code-ReviewFound 0/6 approved changesets -- score normalized to 0
10Contributorsproject has 34 contributing companies or organizations
10Dangerous-Workflowno dangerous workflow patterns detected
10Dependency-Update-Toolupdate tool detected
0Fuzzingproject is not fuzzed
10Licenselicense file detected
10Maintained30 commit(s) and 8 issue activity found in the last 90 days -- score normalized to 10
10Packagingpackaging workflow detected
9Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 9
10SASTSAST tool is run on all commits
10Security-Policysecurity policy file detected
n/aSigned-Releasesno releases found
10Token-PermissionsGitHub workflow tokens follow principle of least privilege
1Vulnerabilities9 existing vulnerabilities detected
All dependencies 235

Full resolved dependency set from the GitHub dependency graph: 0 direct and 235 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.

RegistryPackageVersionRelation
npm@antora/asciidoc-loader3.2.0-rc.3indirect
npm@antora/assembler1.0.0-rc.10indirect
npm@antora/atlas-extension1.0.0-alpha.5indirect
npm@antora/cli3.2.0-rc.3indirect
npm@antora/collector-extension1.0.3indirect
npm@antora/content-aggregator3.2.0-rc.3indirect
npm@antora/content-classifier3.2.0-rc.3indirect
npm@antora/document-converter3.2.0-rc.3indirect
npm@antora/expand-path-helper3.0.0indirect
npm@antora/file-publisher3.2.0-rc.3indirect
npm@antora/logger3.2.0-rc.3indirect
npm@antora/navigation-builder3.2.0-rc.3indirect
npm@antora/page-composer3.2.0-rc.3indirect
npm@antora/pdf-extension1.0.0-rc.10indirect
npm@antora/playbook-builder3.2.0-rc.3indirect
npm@antora/redirect-producer3.2.0-rc.3indirect
npm@antora/run-command-helper1.0.3indirect
npm@antora/run-command-helper1.1.0indirect
npm@antora/site-generator3.2.0-rc.3indirect
npm@antora/site-mapper3.2.0-rc.3indirect
npm@antora/site-publisher3.2.0-rc.3indirect
npm@antora/ui-loader3.2.0-rc.3indirect
npm@antora/user-require-helper3.0.0indirect
npm@asciidoctor/core2.2.9indirect
npm@asciidoctor/reducer1.1.2indirect
npm@asciidoctor/tabs1.0.0-beta.6indirect
npm@babel/runtime7.29.7indirect
npm@iarna/toml2.2.5indirect
npm@nodable/entities2.1.1indirect
npm@nodelib/fs.scandir2.1.5indirect
npm@nodelib/fs.stat2.0.5indirect
npm@nodelib/fs.walk1.2.8indirect
npm@pinojs/redact0.4.0indirect
npm@solid-primitives/refs1.1.3indirect
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npm@solid-primitives/utils6.4.0indirect
npm@springio/antora-extensions1.14.13indirect
npm@springio/asciidoctor-extensions1.0.0-alpha.18indirect
npmabort-controller3.0.0indirect
npmantora3.2.0-rc.3indirect
npmarchiver8.0.0indirect
npmargparse2.0.1indirect
npmasciidoctor-opal-runtime0.3.4indirect
npmasciinema-player3.15.1indirect
npmasync3.2.6indirect
npmasync-lock1.4.1indirect
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npmb4a1.8.1indirect
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npmbuffer5.7.1indirect
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npmbuffer-crc320.2.13indirect
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npmcache-directory2.0.0indirect
npmcall-bind1.0.9indirect
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npmcall-bound1.0.4indirect
npmci2.3.0indirect
npmclean-git-ref2.0.1indirect
npmclone2.1.2indirect
npmcommander14.0.3indirect
npmcommander2.20.3indirect
npmcompress-commons7.0.1indirect
npmconvict6.2.5indirect
npmcore-util-is1.0.3indirect
npmcrc-321.2.2indirect
npmcrc32-stream7.0.1indirect
npmcsstype3.2.3indirect
npmdecompress4.2.1indirect
npmdecompress-response6.0.0indirect
npmdecompress-tar4.1.1indirect
npmdecompress-tarbz24.1.1indirect
npmdecompress-targz4.1.1indirect
npmdecompress-unzip4.0.1indirect
npmdefine-data-property1.1.4indirect
npmdiff30.0.3indirect
npmdunder-proto1.0.1indirect
npmend-of-stream1.4.5indirect
npmes-define-property1.0.1indirect
npmes-errors1.3.0indirect
npmes-object-atoms1.1.2indirect
npmevent-target-shim5.0.1indirect
npmevents3.3.0indirect
npmevents-universal1.0.1indirect
npmfast-fifo1.3.2indirect
npmfast-glob3.3.3indirect
npmfast-xml-builder1.2.0indirect
npmfast-xml-parser5.8.0indirect
npmfastq1.20.1indirect
npmfd-slicer1.1.0indirect
npmfile-type3.9.0indirect
npmfile-type5.2.0indirect
npmfile-type6.2.0indirect
npmfill-range7.1.1indirect
npmfor-each0.3.5indirect
npmfs-constants1.0.0indirect
npmfunction-bind1.1.2indirect
npmget-intrinsic1.3.0indirect
npmget-proto1.0.1indirect
npmget-stream2.3.1indirect
npmglob-parent5.1.2indirect
npmgopd1.2.0indirect
npmgraceful-fs4.2.11indirect
npmhandlebars4.7.9indirect
npmhas-property-descriptors1.0.2indirect
npmhas-symbols1.1.0indirect
npmhas-tostringtag1.0.2indirect
npmhasown2.0.4indirect
npmhpagent1.2.0indirect
npmieee7541.2.1indirect
npmignore5.3.2indirect
npminherits2.0.4indirect
npmis-callable1.2.7indirect
npmis-extglob2.1.1indirect
npmis-glob4.0.3indirect
npmis-natural-number4.0.1indirect
npmis-number7.0.0indirect
npmis-stream1.1.0indirect
npmis-stream4.0.1indirect
npmis-typed-array1.1.15indirect
npmisarray1.0.0indirect
npmisarray2.0.5indirect
npmisomorphic-git1.38.10indirect
npmjs-yaml4.1.1indirect
npmjs-yaml4.2.0indirect
npmjs-yaml5.3.0indirect
npmjson52.2.3indirect
npmlazystream1.0.1indirect
npmlodash.clonedeep4.5.0indirect
npmmake-dir1.3.0indirect
npmmath-intrinsics1.1.0indirect
npmmerge21.4.1indirect
npmmicromatch4.0.8indirect
npmmime-db1.54.0indirect
npmmime-types3.0.2indirect
npmmimic-response3.1.0indirect
npmminimatch10.2.5indirect
npmminimist1.2.8indirect
npmminimisted2.0.1indirect
npmmulti-progress4.0.0indirect
npmneo-async2.6.2indirect
npmnode-gzip1.1.2indirect
npmnormalize-path3.0.0indirect
npmobject-assign4.1.1indirect
npmon-exit-leak-free2.1.2indirect
npmonce1.4.0indirect
npmpako1.0.11indirect
npmpath-expression-matcher1.5.0indirect
npmpend1.2.0indirect
npmpicomatch2.3.2indirect
npmpicomatch4.0.5indirect
npmpify2.3.0indirect
npmpify3.0.0indirect
npmpify4.0.1indirect
npmpinkie2.0.4indirect
npmpinkie-promise2.0.1indirect
npmpino10.3.1indirect
npmpino-abstract-transport3.0.0indirect
npmpino-std-serializers7.1.0indirect
npmpossible-typed-array-names1.1.0indirect
npmprocess0.11.10indirect
npmprocess-nextick-args2.0.1indirect
npmprocess-warning5.1.0indirect
npmprogress2.0.3indirect
npmqueue-microtask1.2.3indirect
npmquick-format-unescaped4.0.4indirect
npmreadable-stream2.3.8indirect
npmreadable-stream4.7.0indirect
npmreaddir-glob3.0.0indirect
npmreal-require0.2.0indirect
npmreal-require1.0.0indirect
npmremove-trailing-separator1.1.0indirect
npmreplace-ext2.0.0indirect
npmreusify1.1.0indirect
npmrun-parallel1.2.0indirect
npmsafe-buffer5.1.2indirect
npmsafe-buffer5.2.1indirect
npmsafe-stable-stringify2.5.0indirect
npmseek-bzip1.0.6indirect
npmseroval1.5.4indirect
npmseroval-plugins1.5.4indirect
npmset-function-length1.2.2indirect
npmsha.js2.4.12indirect
npmshould-proxy1.0.4indirect
npmsimple-concat1.0.1indirect
npmsimple-get4.0.1indirect
npmsolid-js1.9.13indirect
npmsolid-transition-group0.2.3indirect
npmsonic-boom4.2.1indirect
npmsource-map0.6.1indirect
npmsplit24.2.0indirect
npmstreamx2.27.0indirect
npmstring_decoder1.1.1indirect
npmstring_decoder1.3.0indirect
npmstrip-dirs2.1.0indirect
npmstrnum2.3.0indirect
npmtar-stream1.6.2indirect
npmtar-stream3.2.0indirect
npmteex1.0.1indirect
npmtext-decoder1.2.7indirect
npmthread-stream4.2.0indirect
npmthrough2.3.8indirect
npmto-buffer1.2.2indirect
npmto-regex-range5.0.1indirect
npmtyped-array-buffer1.0.3indirect
npmuglify-js3.19.3indirect
npmunbzip2-stream1.4.3indirect
npmunxhr1.2.0indirect
npmutil-deprecate1.0.2indirect
npmvinyl3.0.1indirect
npmwhich-typed-array1.1.21indirect
npmwordwrap1.0.0indirect
npmwrappy1.0.2indirect
npmxdg-basedir3.0.0indirect
npmxml-naming0.1.0indirect
npmxtend4.0.2indirect
npmyargs-parser20.2.9indirect
npmyauzl2.10.0indirect
npmyauzl3.4.0indirect
npmyazl3.3.1indirect
npmzip-stream7.0.5indirect
Dependency advisories 4

This repository publishes no package the index resolves, so its own dependency graph was assessed — 235 packages, which also include development and test pins that never ship: 4 carry known advisories, of which 0 are direct.

PackageVersionRelationSeverityAdvisoriesFixed in
decompress4.2.1indirectcritical311.1.3
brace-expansion5.0.6indirecthigh35.0.9
js-yaml4.1.1indirecthigh34.3.1
js-yaml4.2.0indirecthigh24.3.1

An advisory means the version recorded in the dependency graph falls inside an advisory’s affected range. Reachability is not analysed, and the graph includes development and test pins — a finding may concern tooling rather than shipped software.

Raw JSON report machine-readable

Feedback

Spotted something off in this report, or have thoughts to share? Wrong measurements, missed tooling, ideas, questions — anything is welcome. Every message is read and gets a response.

The message is kept through sign-in.

Scores are signals, not warranties. They reflect publicly visible practices on GitHub — not a code audit, and not a security guarantee.

Missing data is excluded and weights renormalized, never scored as zero. Methodology is versioned and open: metrics v2.10.0, schema v0.34.0 — full methodology · metrics wiki.

How one result sits in the wider record: aggregate statistics.