GoogleCloudPlatform / prometheus - Conditional Complexity

Intro

Conditional complexity (also called cyclomatic complexity) is a term used to measure the complexity of software. The term refers to the number of possible paths through a program function. A higher value ofter means higher maintenance and testing costs (infosecinstitute.com).
Conditional complexity is calculated by counting all conditions in the program that can affect the execution path (e.g. if statement, loops, switches, and/or operators, try and catch blocks...).
Conditional complexity is measured at the unit level (methods, functions...).
Units are classified in four categories based on the measured McCabe index: 1-5 (simple units), 6-10 (medium complex units), 11-25 (complex units), 26+ (very complex units).

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Conditional Complexity Overall

There are 4,121 units with 66,323 lines of code in units (74.7% of code).

15 very complex units (6,128 lines of code)
52 complex units (6,930 lines of code)
228 medium complex units (13,950 lines of code)
437 simple units (13,056 lines of code)
3,389 very simple units (26,259 lines of code)

Legend:

51+

26-50

11-25

6-10

1-5

Alternative Visuals

3D view of all units

Conditional Complexity per Extension

51+

26-50

11-25

6-10

1-5

Conditional Complexity per Logical Component

primary logical decomposition

51+

26-50

11-25

6-10

1-5

Most Complex Units

Top 50 most complex units

Unit	# lines	McCabe index	# params
func() in model/textparse/openmetricslex.l.go	696	157	1
func() in promql/parser/generated_parser.y.go	829	156	1
func() in prompb/types.pb.go	525	151	1
func() in prompb/io/prometheus/client/metrics.pb.go	519	149	1
func() in model/textparse/promlex.l.go	479	128	1
func main() in cmd/prometheus/main.go	854	97	0
func() in promql/engine.go	418	88	1
func() in prompb/io/prometheus/client/metrics.pb.go	283	84	1
func() in promql/engine.go	265	81	1
func() in tsdb/head_wal.go	342	78	1
func() in promql/parser/parse.go	149	73	1
export function analyzeCompletion() in web/ui/module/codemirror-promql/src/complete/hybrid.ts	166	64	2
func() in prompb/types.pb.go	210	61	1
func Checkpoint() in tsdb/wlog/checkpoint.go	207	54	5
func() in prompb/types.pb.go	186	53	1
func() in scrape/scrape.go	203	49	1
func() in web/federate.go	223	48	1
func() in model/relabel/relabel.go	49	47	1
func() in prompb/io/prometheus/client/metrics.pb.go	167	47	1
func() in prompb/remote.pb.go	158	46	1
func() in prompb/types.pb.go	165	46	1
func compactBuckets[IBC InternalBucketCount]() in model/histogram/generic.go	169	45	4
func() in prompb/remote.pb.go	153	44	1
func() in tsdb/head_append.go	223	43	1
func() in tsdb/querier.go	188	43	1
func lexStatements() in promql/parser/lex.go	121	43	1
func() in tsdb/head.go	177	42	1
func() in model/textparse/openmetricsparse.go	129	41	1
func() in prompb/types.pb.go	141	41	1
func() in cmd/promtool/unittest.go	182	41	1
func checkConfig() in cmd/promtool/main.go	117	40	3
func() in tsdb/head_wal.go	174	39	1
func() in prompb/io/prometheus/client/metrics.pb.go	131	37	1
func() in prompb/types.pb.go	133	37	1
func() in prompb/io/prometheus/client/metrics.pb.go	127	36	1
func open() in tsdb/db.go	156	35	6
func() in promql/engine.go	150	35	1
func main() in cmd/promtool/main.go	225	35	0
func() in prompb/remote.pb.go	118	33	1
func() in prompb/types.pb.go	118	33	1
func() in tsdb/wlog/watcher.go	118	33	1
func() in promql/engine.go	106	33	1
func() in prompb/io/prometheus/client/metrics.pb.go	114	32	1
func() in prompb/types.pb.go	114	32	1
func() in prompb/io/prometheus/client/metrics.pb.go	114	31	1
func() in prompb/types.pb.go	114	31	1
func PostingsForMatchers() in tsdb/querier.go	93	31	2
func() in tsdb/agent/db.go	165	31	1
func() in discovery/kubernetes/endpointslice.go	134	31	1
func() in model/textparse/promparse.go	103	30	1