• There are 259 files with units, with 26,256 lines of code.
• 0 very complex files (McCabe index sum 251+; 0 lines of code)
• 4 complex files (McCabe index sum 126-250; 2,523 lines of code)
• 12 medium complex files (McCabe index sum 51-125; 4,463 lines of code)
• 33 slightly complex files (McCabe index sum 26-50; 5,894 lines of code)
• 210 simple files (McCabe index sum 1-25; 13,376 lines of code)
• 92 main files have no units (e.g. languages without unit analysis, or files without functions) and are not classified.

The McCabe index of a file grows with its size: per 100 lines tells a large but plain file from a dense one, and most complex unit whether the complexity sits in one unit or is spread over many.

File	# lines	# units	McCabe index (sum)	per 100 lines	most complex unit
IpcLogEntry.java in spectator-ext-ipc/src/main/java/com/netflix/spectator/ipc	838	89	185	22	12
PatternUtils.java in spectator-api/src/main/java/com/netflix/spectator/impl/matcher	540	27	182	34	27
QueryIndex.java in spectator-reg-atlas/src/main/java/com/netflix/spectator/atlas/impl	667	37	165	25	22
Optimizer.java in spectator-api/src/main/java/com/netflix/spectator/impl/matcher	478	32	150	31	10
Hash64.java in spectator-api/src/main/java/com/netflix/spectator/impl	532	53	112	21	19
Parser.java in spectator-api/src/main/java/com/netflix/spectator/impl/matcher	332	22	107	32	20
PrefixTree.java in spectator-reg-atlas/src/main/java/com/netflix/spectator/atlas/impl	368	30	107	29	12
HttpLogEntry.java in spectator-ext-sandbox/src/main/java/com/netflix/spectator/sandbox	382	54	86	23	7
ArrayTagSet.java in spectator-api/src/main/java/com/netflix/spectator/api	393	26	83	21	11
Parser.java in spectator-reg-atlas/src/main/java/com/netflix/spectator/atlas/impl	268	13	75	28	38
CardinalityLimiters.java in spectator-api/src/main/java/com/netflix/spectator/api/patterns	327	14	70	21	13
PrototypeMeasurementFilter.java in spectator-web-spring/src/main/java/com/netflix/spectator/controllers/filter	206	26	64	31	8
Timer.java in spectator-api/src/main/java/com/netflix/spectator/api	697	59	61	9	2
PolledMeter.java in spectator-api/src/main/java/com/netflix/spectator/api/patterns	489	28	58	12	6
AsciiSet.java in spectator-api/src/main/java/com/netflix/spectator/impl	177	20	54	31	8
HttpRequestBuilder.java in spectator-ext-ipc/src/main/java/com/netflix/spectator/ipc/http	292	30	51	17	11
Registry.java in spectator-api/src/main/java/com/netflix/spectator/api	209	39	49	23	4
IndexOfSeqMatcher.java in spectator-api/src/main/java/com/netflix/spectator/impl/matcher	188	25	48	26	13
ServerGroup.java in spectator-ext-ipc/src/main/java/com/netflix/spectator/ipc	120	14	46	38	11
Utils.java in spectator-api/src/main/java/com/netflix/spectator/api	172	19	43	25	6
HttpRequestBuilder.java in spectator-ext-sandbox/src/main/java/com/netflix/spectator/sandbox	218	24	42	19	9
AtlasConfig.java in spectator-reg-atlas/src/main/java/com/netflix/spectator/atlas	110	23	41	37	4
IndexOfMatcher.java in spectator-api/src/main/java/com/netflix/spectator/impl/matcher	148	19	40	27	9
Scheduler.java in spectator-api/src/main/java/com/netflix/spectator/impl	278	18	38	14	7
CompositeRegistry.java in spectator-api/src/main/java/com/netflix/spectator/api	284	15	38	13	4
GcLogger.java in spectator-ext-gc/src/main/java/com/netflix/spectator/gc	206	9	37	18	11
Evaluator.java in spectator-reg-atlas/src/main/java/com/netflix/spectator/atlas/impl	211	14	37	18	15
HostSanitizer.java in spectator-ext-ipc/src/main/java/com/netflix/spectator/ipc/http	169	9	35	21	10
StringReplace.java in spectator-api/src/jmh/java/com/netflix/spectator/perf	151	23	35	23	4
ZeroOrMoreMatcher.java in spectator-api/src/main/java/com/netflix/spectator/impl/matcher	122	14	34	28	11
AbstractRegistry.java in spectator-api/src/main/java/com/netflix/spectator/api	265	13	34	13	11
Rollups.java in spectator-reg-atlas/src/main/java/com/netflix/spectator/atlas	146	12	33	23	11
SeqMatcher.java in spectator-api/src/main/java/com/netflix/spectator/impl/matcher	133	17	32	24	5
PercentileBuckets.java in spectator-api/src/main/java/com/netflix/spectator/api/histogram	179	10	32	18	9
Query.java in spectator-reg-atlas/src/main/java/com/netflix/spectator/atlas/impl	596	20	32	5	5
StepDouble.java in spectator-api/src/main/java/com/netflix/spectator/impl	139	17	31	22	4
PrototypeMeasurementFilterSpecification.java in spectator-web-spring/src/main/java/com/netflix/spectator/controllers/filter	138	24	30	22	3
SpectatorRequestMetricCollector.java in spectator-ext-aws/src/main/java/com/netflix/spectator/aws	203	15	30	15	6
SpectatorExecutionInterceptor.java in spectator-ext-aws2/src/main/java/com/netflix/spectator/aws2	141	11	30	21	8
PathSanitizer.java in spectator-ext-ipc/src/main/java/com/netflix/spectator/ipc/http	89	8	29	33	11
OrMatcher.java in spectator-api/src/main/java/com/netflix/spectator/impl/matcher	122	13	29	24	5
AtlasRegistry.java in spectator-reg-atlas/src/main/java/com/netflix/spectator/atlas	345	12	29	8	6
OrStartsWithMatcher.java in spectator-api/src/main/java/com/netflix/spectator/impl/matcher	125	20	28	22	6
IpcStatus.java in spectator-ext-ipc/src/main/java/com/netflix/spectator/ipc	74	4	27	36	16
SeqServerGroup.java in spectator-ext-ipc/src/jmh/java/com/netflix/spectator/ipc	85	8	27	32	5
BucketFunctions.java in spectator-api/src/main/java/com/netflix/spectator/api/histogram	188	21	27	14	3
DefaultPlaceholderId.java in spectator-ext-placeholders/src/main/java/com/netflix/spectator/placeholders	111	17	26	23	7
RepeatMatcher.java in spectator-api/src/main/java/com/netflix/spectator/impl/matcher	95	12	26	27	7
DistinctCountSketch.java in spectator-api/src/main/java/com/netflix/spectator/api/patterns	134	13	26	19	6
ZeroOrOneMatcher.java in spectator-api/src/main/java/com/netflix/spectator/impl/matcher	95	14	25	26	6

• File complexity is the sum of the McCabe indexes (conditional complexity) of the units (methods, functions...) in a file.
• Files are classified in five categories based on that sum: 1-25 (simple files), 26-50 (slightly complex files), 51-125 (medium complex files), 126-250 (complex files), 251+ (very complex files). The default bands are five times the unit complexity bands, as a file is a group of units.
• Only main code files with units are classified. Files without units (languages without unit analysis, or files without functions) have no complexity to measure and are left out rather than counted as simple.
• A very complex file holds many decisions, which often means it has too many responsibilities: a candidate to split, and a place where changes need more testing.