Public recordExcellent
Software health reportschema 0.31.0 · metrics 2.5.0 · 2026-08-11 08:05 UTC
knurling-rs / defmt
Efficient, deferred formatting for logging on embedded systems
knurling-rs/defmt holds a health index of 88 out of 100, placing it in the Excellent band. It scores highest on Vitality (86/100) and lowest on AI Readiness (50/100). It was last updated today. 2 contributors account for most of its recent work.
88
overall / 100Software 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.
88
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)
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 74 is calibrated to 88 on the published index scale (record calibration 2026-08-02).
Ownership
KnurlingOrganization
489 followers22 public repossince Nov 2016
This repository is backed by an organization — shared, accountable stewardship that can outlive any single maintainer.
Package ecosystems
| Registry | Package | Version | Downloads / mo | Versions | Last publish | Tags |
|---|---|---|---|---|---|---|
| crates.io | defmt | 1.1.1 | 4,741,028 | 29 | 38 days ago | formatterformattingknurlingloggerloggingno-stdembeddedvalue-formatting |
| crates.io | defmt-print | 1.1.0 | 4,163 | 20 | 90 days ago | formattingknurlingloggingembedded |
| crates.io | xtaskpoints to another repo — not scored | 0.1.4 | 243 | 5 | 41 days ago | automationcodesignmacosreleasextaskcommand-line-utilities |
| crates.io | defmt-macros | 1.1.1 | 4,199,078 | 23 | 38 days ago | defmtknurling |
| crates.io | defmt-parser | 1.0.0 | 4,057,054 | 13 | 496 days ago | defmtknurling |
| crates.io | defmt-decoder | 1.1.0 | 33,802 | 24 | 186 days ago | defmtknurling |
| crates.io | qemu-run | 0.3.0 | 38 | 2 | 90 days ago | formattingknurlingloggingqemuembedded |
Metrics by category
Vitality
Is the project alive — is code being written and are releases shipping?
86
Development activity
88Excellent
How it's scored
| 36/36 | Push recency — last push 0 days ago |
| 24.2/36 | Commit cadence — 35/52 weeks with commits |
| 18/18 | Commit volume — 171 commits in the last year |
| 10/10 | OpenSSF Scorecard: Maintained — 30 commit(s) and 2 issue activity found in the last 90 days -- score normalized to 10 |
Inputs used
| commits_last_year | 171 |
| human_commit_share | 1 |
| days_since_last_push | 0 |
| active_weeks_last_year | 35 |
Release discipline
84Excellent
How it's scored
| 27/27 | Ships releases — 23 releases published |
| 36/36 | Release recency — latest release 38 days ago |
| 12.6/27 | Release cadence — a release every ~123.4 days |
| 0/10 | OpenSSF Scorecard: Signed-Releases — no data |
Inputs used
| releases_count | 23 |
| latest_release_tag | defmt-v1.1.1 |
| releases_from_tags | no |
| days_since_latest_release | 38 |
| mean_days_between_releases | 123.4 |
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?
72
Popularity & adoption
73Good
How it's scored
| 50/60 | Stars — 1,209 stars |
| 17.6/25 | Forks — 129 forks |
| 5.3/15 | Watchers — 10 watchers |
Inputs used
| forks | 129 |
| stars | 1,209 |
| watchers | 10 |
| growth_state | unverified |
| growth_factor_pct | 100 |
| growth_unverified_reason | no_history |
Community health
50Moderate
How it's scored
| 22.5/22.5 | README |
| 22.5/22.5 | License — recognized license (Apache-2.0) |
| 0/18 | CONTRIBUTING guide |
| 0/13.5 | Code of conduct |
| 0/7.2 | Issue template |
| 0/6.3 | PR template |
Inputs used
| has_readme | yes |
| has_license | yes |
| readme_badges | 0 |
| has_contributing | no |
| has_issue_template | no |
| has_code_of_conduct | no |
| readme_badge_services | — |
| has_pull_request_template | no |
Ecosystem adoption (downloads)
100Exceptional
How it's scored
| 80/80 | Monthly downloads — 13,035,163 downloads/month across crates |
| 0/20 | Registry dependents — not reported by this ecosystem |
Inputs used
| packages | defmt, defmt-print, defmt-macros, defmt-parser, defmt-decoder, qemu-run |
| dependents | — |
| ecosystems | crates |
| total_downloads | 65,257,402 |
| monthly_downloads | 13,035,163 |
Excluded from scoring (no data or not applicable): Registry dependents. Remaining weights renormalized.
Sustainability & Governance
Will the project survive its people — bus factor, responsiveness, who backs it, and package upkeep?
77
Maintainer resilience (bus factor)
64Moderate
How it's scored
| 25.2/54 | Bus factor — 2 contributor(s) cover half of all commits |
| 15/22.5 | Commit distribution — top contributor authored 33% of commits |
| 13.5/13.5 | Contributor breadth — 81 contributors |
| 10/10 | OpenSSF Scorecard: Contributors — project has 50 contributing companies or organizations |
Inputs used
| bus_factor | 2 |
| contributors_sampled | 81 |
| top_contributor_share | 0.334 |
Issue & PR responsiveness
80Excellent
How it's scored
| 31.4/42 | Issue resolution — 75% of issues closed |
| 27.4/30 | PR acceptance — 593/650 decided PRs merged |
| 6.5/13 | Newcomer PR acceptance — 1/2 first-time contributors' PRs merged in 30d |
| 15/15 | OpenSSF Scorecard: Code-Review — all changesets reviewed |
Inputs used
| merged_prs | 593 |
| open_issues | 106 |
| closed_issues | 313 |
| prs_merged_7d | 1 |
| prs_decided_7d | 1 |
| prs_merged_30d | 7 |
| prs_decided_30d | 9 |
| issue_closed_ratio | 0.747 |
| closed_unmerged_prs | 57 |
| first_time_authors_30d | 2 |
| first_time_prs_merged_30d | 1 |
| first_time_prs_decided_30d | 2 |
Ownership & stewardship
71Good
How it's scored
| 30/30 | Ownership backing — organization-owned |
| 0/20 | Verified domain |
| 19.3/25 | Owner reach — 489 followers of knurling-rs |
| 21.9/25 | Track record — 22 public repos, account ~9 yr old |
Inputs used
| followers | 489 |
| owner_type | Organization |
| is_verified | — |
| owner_login | knurling-rs |
| public_repos | 22 |
| account_age_days | 3,563 |
Package maintenance
100Exceptional
How it's scored
| 25/25 | Published & resolvable — 6 package(s) on crates |
| 35/35 | Publish recency — latest publish 38 days ago |
| 20/20 | Version history — 29 published versions |
| 20/20 | Not deprecated — active, not deprecated or yanked |
Inputs used
| packages | defmt, defmt-print, defmt-macros, defmt-parser, defmt-decoder, qemu-run |
| ecosystems | crates |
| any_deprecated | no |
| min_days_since_publish | 38 |
Engineering Quality
Are baseline engineering and documentation practices in place?
67
Engineering practices
68Good
How it's scored
| 24/24 | CI workflows — 3 workflow(s) |
| 24/24 | Tests present |
| 0/16 | Linter config |
| 0/9.6 | Pre-commit hooks |
| 0/6.4 | .editorconfig |
| 20/20 | OpenSSF Scorecard: CI-Tests — 14 out of 14 merged PRs checked by a CI test -- score normalized to 10 |
Inputs used
| has_ci | yes |
| has_tests | yes |
| has_editorconfig | no |
| has_linter_config | no |
| has_precommit_config | no |
Documentation
65Good
How it's scored
| 30/30 | README |
| 0/25 | Documentation directory |
| 15/15 | Documentation / homepage site — https://defmt.ferrous-systems.com/ |
| 10/10 | Repository description |
| 10/10 | Topics — 5 topics |
| 0/10 | Wiki |
Inputs used
| topics | logging, embedded-systems, rust, rust-tools, ferrous-systems |
| has_wiki | no |
| homepage | https://defmt.ferrous-systems.com/ |
| has_readme | yes |
| has_docs_dir | no |
| has_description | yes |
Security
Are visible security and supply-chain practices strong, without unresolved high-risk jurisdiction exposure?
69
Security posture
61Moderate
How it's scored
| 7.5/7.5 | Binary-Artifacts — no binaries found in the repo |
| 0/7.5 | Branch-Protection — no data |
| 2.5/2.5 | CI-Tests — 14 out of 14 merged PRs checked by a CI test -- score normalized to 10 |
| 0/2.5 | CII-Best-Practices — no effort to earn an OpenSSF best practices badge detected |
| 7.5/7.5 | Code-Review — all changesets reviewed |
| 2.5/2.5 | Contributors — project has 50 contributing companies or organizations |
| 10/10 | Dangerous-Workflow — no dangerous workflow patterns detected |
| 0/7.5 | Dependency-Update-Tool — no update tool detected |
| 0/5 | Fuzzing — project is not fuzzed |
| 2.5/2.5 | License — license file detected |
| 7.5/7.5 | Maintained — 30 commit(s) and 2 issue activity found in the last 90 days -- score normalized to 10 |
| 0/5 | Packaging — no data |
| 0/5 | Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 0 |
| 0/5 | SAST — SAST tool is not run on all commits -- score normalized to 0 |
| 4.5/5 | Security-Policy — security policy file detected |
| 0/7.5 | Signed-Releases — no data |
| 0/7.5 | Token-Permissions — detected GitHub workflow tokens with excessive permissions |
| 7.5/7.5 | Vulnerabilities — 0 existing vulnerabilities detected |
Inputs used
| source | openssf_scorecard |
| checks_evaluated | 15 |
| scorecard_version | v5.5.0 |
| checks_inconclusive | 3 |
| scorecard_aggregate | 6.1 |
Excluded from scoring (no data or not applicable): branch_protection, packaging, signed_releases. Remaining weights renormalized.
Dependency advisories
100Exceptional
How it's scored
| 35/35 | Direct dependencies free of known advisories — no direct dependency carries a known advisory |
| 25/25 | Indirect dependencies free of known advisories — no indirect dependency carries a known advisory |
| 0/40 | No advisories left outstanding — no advisory carries a publication date |
Inputs used
| source | osv |
| advisories | 0 |
| affected_packages | 0 |
| assessed_packages | 28 |
| unassessed_packages | 0 |
| affected_by_severity | none |
| direct_affected_packages | 0 |
Excluded from scoring (no data or not applicable): No advisories left outstanding. Remaining weights renormalized. Matched the crates:defmt@1.1.1 runtime dependency closure — what installing the published package pulls in — 28 packages. 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.
50
Agent context & guidance
21At Risk
How it's scored
| 0/45 | Agent instructions — no CLAUDE.md / AGENTS.md / editor rules |
| 0/15 | Machine-readable docs (llms.txt) |
| 21.3/40 | Legible commit history — 40 of 100 human commits state their intent (structured subject or explanatory body) |
Inputs used
| has_llms_txt | no |
| legible_history_share | 0.4 |
| agent_instruction_files | — |
| agent_instruction_max_bytes | — |
Verify loop (build / test / typecheck)
56Moderate
How it's scored
| 12.6/18 | One-command bootstrap — Cargo.toml, decoder/Cargo.toml, decoder/defmt-json-schema/Cargo.toml (toolchain convention, no task runner) |
| 22/22 | Automated tests |
| 0/11 | Lint / format config |
| 11/11 | Static type checking — Rust (statically typed) |
| 10/10 | Reproducible environment — lockfile |
| 0/10 | Demonstrated agent practice — no agent-authored commits among the last 100 |
| 0/8 | Automated maintenance — no automated dependency updates observed |
| 0/10 | OpenSSF Scorecard: Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 0 |
Inputs used
| has_nix | no |
| has_tests | yes |
| lockfiles | Cargo.lock |
| has_dockerfile | no |
| typed_language | yes |
| bootstrap_files | — |
| has_devcontainer | no |
| has_linter_config | no |
| typecheck_configs | — |
| agent_commit_share | 0 |
| toolchain_manifests | Cargo.toml, decoder/Cargo.toml, decoder/defmt-json-schema/Cargo.toml, defmt-03/Cargo.toml, defmt/Cargo.toml, firmware/Cargo.toml, firmware/defmt-itm/Cargo.toml, firmware/defmt-rtt/Cargo.toml, firmware/defmt-semihosting/Cargo.toml, firmware/defmt-test/Cargo.toml, firmware/defmt-test/macros/Cargo.toml, firmware/panic-probe/Cargo.toml, firmware/qemu/Cargo.toml, macros/Cargo.toml, parser/Cargo.toml, print/Cargo.toml, qemu-run/Cargo.toml, xtask/Cargo.toml |
| dependency_bot_commit_share | 0 |
Code legibility for models
100Exceptional
How it's scored
| 45/45 | Type-checkable code — Rust (statically typed) |
| 55/55 | Manageable file sizes — 0/176 source files over 60KB |
Inputs used
| primary_language | Rust |
| largest_source_bytes | 33,730 |
| source_files_sampled | 176 |
| oversized_source_files | 0 |
How it's scored
| 0/40 | API schema (OpenAPI/GraphQL/proto) |
| 0/20 | MCP server |
| 40/40 | Runnable examples — examples |
Inputs used
| example_dirs | examples |
| has_mcp_signal | no |
| api_schema_files | — |
Key facts
1,209GitHub stars
81contributors
171commits, last 12 months
0days since last push
23releases
2bus factor
106open issues
crates.iopackage ecosystems
Data collection warnings
- Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token
- crates package 'xtask' points at a different repository (https://github.com/arcboxlabs/xtask); excluded from ecosystem scoring
- GitHub dependency-graph SBOM unavailable (404); the dependency graph may be disabled for this repository
More detail
Star and fork history 0 ★ / 129 ⇿
0Stars
129Forks
23Releases
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.
Major 0Minor 0Patch 0
Each point covers 6 days.
OpenSSF Scorecard 6.1 / 10
6.1aggregate
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).
| 10 | Binary-Artifacts | no binaries found in the repo |
| n/a | Branch-Protection | internal error: error during branchesHandler.setup: internal error: some github tokens can't read classic branch protection rules: https://github.com/ossf/scorecard-action/blob/main/docs/authentication/fine-grained-auth-token.md |
| 10 | CI-Tests | 14 out of 14 merged PRs checked by a CI test -- score normalized to 10 |
| 0 | CII-Best-Practices | no effort to earn an OpenSSF best practices badge detected |
| 10 | Code-Review | all changesets reviewed |
| 10 | Contributors | project has 50 contributing companies or organizations |
| 10 | Dangerous-Workflow | no dangerous workflow patterns detected |
| 0 | Dependency-Update-Tool | no update tool detected |
| 0 | Fuzzing | project is not fuzzed |
| 10 | License | license file detected |
| 10 | Maintained | 30 commit(s) and 2 issue activity found in the last 90 days -- score normalized to 10 |
| n/a | Packaging | packaging workflow not detected |
| 0 | Pinned-Dependencies | dependency not pinned by hash detected -- score normalized to 0 |
| 0 | SAST | SAST tool is not run on all commits -- score normalized to 0 |
| 9 | Security-Policy | security policy file detected |
| n/a | Signed-Releases | no releases found |
| 0 | Token-Permissions | detected GitHub workflow tokens with excessive permissions |
| 10 | Vulnerabilities | 0 existing vulnerabilities detected |
Direct dependencies 42
| Registry | Package | Version constraint | Manifest |
|---|---|---|---|
| crates.io | byteorder | 1 | decoder/Cargo.toml |
| crates.io | colored | 2 | decoder/Cargo.toml |
| crates.io | defmt-parser | =1.0.0 | decoder/Cargo.toml |
| crates.io | ryu | 1 | decoder/Cargo.toml |
| crates.io | nom | 7 | decoder/Cargo.toml |
| crates.io | time | 0.3 | decoder/Cargo.toml |
| crates.io | dissimilar | 1 | decoder/Cargo.toml |
| crates.io | log | 0.4 | decoder/Cargo.toml |
| crates.io | defmt-json-schema | 0.1 | decoder/Cargo.toml |
| crates.io | anyhow | 1.0.65 | decoder/Cargo.toml |
| crates.io | gimli | 0.29 | decoder/Cargo.toml |
| crates.io | object | 0.36 | decoder/Cargo.toml |
| crates.io | serde | 1 | decoder/Cargo.toml |
| crates.io | serde_json | 1 | decoder/Cargo.toml |
| crates.io | regex | 1 | decoder/Cargo.toml |
| crates.io | alterable_logger | 1 | decoder/Cargo.toml |
| crates.io | cbor-edn | 0.0.6 | decoder/Cargo.toml |
| crates.io | defmt10 | 1 | defmt-03/Cargo.toml |
| crates.io | defmt-macros | =1.1.1 | defmt/Cargo.toml |
| crates.io | bitflags | 1 | defmt/Cargo.toml |
| crates.io | defmt-parser | =1.0.0 | macros/Cargo.toml |
| crates.io | proc-macro2 | 1 | macros/Cargo.toml |
| crates.io | quote | 1 | macros/Cargo.toml |
| crates.io | syn | 2 | macros/Cargo.toml |
| crates.io | thiserror | 2 | parser/Cargo.toml |
| crates.io | anyhow | 1 | print/Cargo.toml |
| crates.io | clap | 4.0 | print/Cargo.toml |
| crates.io | defmt-decoder | 1 | print/Cargo.toml |
| crates.io | goblin | 0.9 | print/Cargo.toml |
| crates.io | log | 0.4 | print/Cargo.toml |
| crates.io | notify | 8 | print/Cargo.toml |
| crates.io | tokio | 1.38 | print/Cargo.toml |
| crates.io | tokio-serial | 5.4 | print/Cargo.toml |
| crates.io | anyhow | 1 | qemu-run/Cargo.toml |
| crates.io | clap | 4.0 | qemu-run/Cargo.toml |
| crates.io | defmt-decoder | 1 | qemu-run/Cargo.toml |
| crates.io | log | 0.4.28 | qemu-run/Cargo.toml |
| crates.io | anyhow | 1 | xtask/Cargo.toml |
| crates.io | clap | 4 | xtask/Cargo.toml |
| crates.io | colored | 2 | xtask/Cargo.toml |
| crates.io | similar | 2.2 | xtask/Cargo.toml |
| crates.io | tempfile | 3.3 | xtask/Cargo.toml |
All dependencies not collected
The resolved dependency set could not be collected for this report: GitHub dependency-graph SBOM unavailable (404); the dependency graph may be disabled for this repository
Dependency advisories 0
Installing crates:defmt@1.1.1 pulls in 28 packages, direct and transitive: 0 carry known advisories, of which 0 are direct dependencies.
No known advisories affect the assessed dependencies.
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
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 v2.5.0, schema v0.31.0 — full methodology · metrics wiki.
How one result sits in the wider record: aggregate statistics — crates.io.