{"adoption": {"forks": 95, "observed_at": "2026-08-28T04:03:42.119606+00:00", "stars": 1129}, "canonical_url": "https://ross.abutalabs.com/products/colossus", "card": {"archived": false, "artifact_type": "framework", "description": "I/O and Microservice library for Scala", "domain": ["backend", "microservices", "web-development", "developer-tools"], "enriched": true, "function": ["http-server", "http-client", "microservices", "monitoring", "serialization", "testing"], "health_score": 20, "homepage": null, "language": "Scala", "license": "Apache-2.0", "license_family": "permissive", "maturity": "maintenance", "member_repos": ["tumblr/colossus"], "name": "tumblr/colossus", "platform": ["jvm"], "pushed_at": "2021-08-14T08:40:07+00:00", "repo": "tumblr/colossus", "stars": 1129, "tags": ["scala", "nio", "high-performance", "service-framework", "metrics", "linux", "macos"], "topics": ["scala", "microservice-framework"], "urls": [], "use_cases": ["build a scala microservice", "high-performance http server in scala", "non-blocking i/o service framework for jvm", "collect and report service metrics", "write scala http clients"], "what_it_is": "Colossus is a lightweight I/O framework for building high-performance Scala microservices, including an HTTP server/client and a standalone metrics library. It was developed by Tumblr and participates in the TechEmpower web framework benchmarks.", "when_to_avoid": ["your team primarily uses Java, Kotlin, or another non-Scala JVM language", "you need a framework with a large ecosystem and frequent updates, as the latest release dates to 2021"], "when_to_choose": ["you are building Scala services on the JVM and want a lightweight, non-blocking I/O framework", "you need a simple HTTP server/client with built-in metrics support"]}, "data_as_of": "2026-08-30T08:39:29.467469+00:00", "members": [{"path": "/products/colossus", "repo": "tumblr/colossus", "role": "main", "score": 23}], "provenance": {"archived": {"kind": "observed", "observed_at": "2026-08-28T04:03:42.119606+00:00", "source": "github"}, "artifact_type": {"confidence": null, "enriched_at": "2026-08-30T06:38:27.885420+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "060c3e372ef0e95f874932be592bb5d3c1a12452888a0a52e91f6cbbe20a17b1", "fetched_at": "2026-08-28T04:03:42.119606+00:00", "kind": "readme", "missing": false, "url": "https://github.com/tumblr/colossus"}], "taxonomy_version": 1}, "description": {"kind": "observed", "observed_at": "2026-08-28T04:03:42.119606+00:00", "source": "github"}, "domain": {"confidence": null, "enriched_at": "2026-08-30T06:38:27.885420+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "060c3e372ef0e95f874932be592bb5d3c1a12452888a0a52e91f6cbbe20a17b1", "fetched_at": "2026-08-28T04:03:42.119606+00:00", "kind": "readme", "missing": false, "url": "https://github.com/tumblr/colossus"}], "taxonomy_version": 1}, "enriched": {"inputs": [], "kind": "computed", "method": "enrichment_status"}, "function": {"confidence": null, "enriched_at": "2026-08-30T06:38:27.885420+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "060c3e372ef0e95f874932be592bb5d3c1a12452888a0a52e91f6cbbe20a17b1", "fetched_at": "2026-08-28T04:03:42.119606+00:00", "kind": "readme", "missing": false, "url": "https://github.com/tumblr/colossus"}], "taxonomy_version": 1}, "health_score": {"inputs": ["days_since_push", "days_since_release", "archived"], "kind": "computed", "method": "health_v1"}, "homepage": {"kind": "observed", "observed_at": "2026-08-28T04:03:42.119606+00:00", "source": "github"}, "language": {"kind": "observed", "observed_at": "2026-08-28T04:03:42.119606+00:00", "source": "github"}, "license": {"kind": "observed", "observed_at": "2026-08-28T04:03:42.119606+00:00", "source": "github"}, "license_family": {"inputs": ["license"], "kind": "computed", "method": "license_family"}, "maturity": {"confidence": null, "enriched_at": "2026-08-30T06:38:27.885420+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "060c3e372ef0e95f874932be592bb5d3c1a12452888a0a52e91f6cbbe20a17b1", "fetched_at": "2026-08-28T04:03:42.119606+00:00", "kind": "readme", "missing": false, "url": "https://github.com/tumblr/colossus"}], "taxonomy_version": 1}, "member_repos": {"kind": "observed", "observed_at": "2026-08-28T04:03:42.119606+00:00", "source": "github"}, "name": {"kind": "observed", "observed_at": "2026-08-28T04:03:42.119606+00:00", "source": "github"}, "platform": {"confidence": null, "enriched_at": "2026-08-30T06:38:27.885420+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "060c3e372ef0e95f874932be592bb5d3c1a12452888a0a52e91f6cbbe20a17b1", "fetched_at": "2026-08-28T04:03:42.119606+00:00", "kind": "readme", "missing": false, "url": "https://github.com/tumblr/colossus"}], "taxonomy_version": 1}, "pushed_at": {"kind": "observed", "observed_at": "2026-08-28T04:03:42.119606+00:00", "source": "github"}, "repo": {"kind": "observed", "observed_at": "2026-08-28T04:03:42.119606+00:00", "source": "github"}, "stars": {"kind": "observed", "observed_at": "2026-08-28T04:03:42.119606+00:00", "source": "github"}, "tags": {"confidence": null, "enriched_at": "2026-08-30T06:38:27.885420+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "060c3e372ef0e95f874932be592bb5d3c1a12452888a0a52e91f6cbbe20a17b1", "fetched_at": "2026-08-28T04:03:42.119606+00:00", "kind": "readme", "missing": false, "url": "https://github.com/tumblr/colossus"}], "taxonomy_version": 1}, "topics": {"kind": "observed", "observed_at": "2026-08-28T04:03:42.119606+00:00", "source": "github"}, "urls": {"kind": "observed", "observed_at": "2026-08-28T04:03:42.119606+00:00", "source": "github"}, "use_cases": {"confidence": null, "enriched_at": "2026-08-30T06:38:27.885420+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "060c3e372ef0e95f874932be592bb5d3c1a12452888a0a52e91f6cbbe20a17b1", "fetched_at": "2026-08-28T04:03:42.119606+00:00", "kind": "readme", "missing": false, "url": "https://github.com/tumblr/colossus"}], "taxonomy_version": 1}, "what_it_is": {"confidence": null, "enriched_at": "2026-08-30T06:38:27.885420+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "060c3e372ef0e95f874932be592bb5d3c1a12452888a0a52e91f6cbbe20a17b1", "fetched_at": "2026-08-28T04:03:42.119606+00:00", "kind": "readme", "missing": false, "url": "https://github.com/tumblr/colossus"}], "taxonomy_version": 1}, "when_to_avoid": {"confidence": null, "enriched_at": "2026-08-30T06:38:27.885420+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "060c3e372ef0e95f874932be592bb5d3c1a12452888a0a52e91f6cbbe20a17b1", "fetched_at": "2026-08-28T04:03:42.119606+00:00", "kind": "readme", "missing": false, "url": "https://github.com/tumblr/colossus"}], "taxonomy_version": 1}, "when_to_choose": {"confidence": null, "enriched_at": "2026-08-30T06:38:27.885420+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "060c3e372ef0e95f874932be592bb5d3c1a12452888a0a52e91f6cbbe20a17b1", "fetched_at": "2026-08-28T04:03:42.119606+00:00", "kind": "readme", "missing": false, "url": "https://github.com/tumblr/colossus"}], "taxonomy_version": 1}}, "score": {"components": {"activity": 0, "longevity": 100, "rhythm": 8}, "computed_at": "2026-09-02T17:46:02.011165+00:00", "flags": [], "formula": "round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)", "inputs": {"age_days": 4313, "days_push": 1845, "days_rel": null, "gap_med": null, "n_releases_24m": 0}, "score": 23, "version": 2}, "staleness": {"enrichment_outdated": false, "low_confidence": false, "scrape_days": 9, "stale_scrape": false}}