uber / kubernetes 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 62,253 units with 785,921 lines of code in units (79.3% of code).

251 very complex units (72,214 lines of code)
708 complex units (92,874 lines of code)
1,639 medium complex units (95,818 lines of code)
3,552 simple units (102,123 lines of code)
56,103 very simple units (422,892 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 ForKind() in staging/src/k8s.io/client-go/applyconfigurations/utils.go	1397	697	1
func() in staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1/generated.pb.go	1671	479	1
func() in staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1/generated.pb.go	1671	479	1
func RegisterConversions() in pkg/apis/core/v1/zz_generated.conversion.go	2293	459	1
func() in staging/src/k8s.io/apiserver/pkg/apis/audit/v1/generated.pb.go	679	196	1
func() in staging/src/k8s.io/api/events/v1/generated.pb.go	530	155	1
func() in staging/src/k8s.io/api/events/v1beta1/generated.pb.go	530	155	1
func() in staging/src/k8s.io/api/admission/v1/generated.pb.go	532	155	1
func() in staging/src/k8s.io/api/admission/v1beta1/generated.pb.go	532	155	1
func() in staging/src/k8s.io/apiserver/pkg/apis/example/v1/generated.pb.go	500	141	1
func() in staging/src/k8s.io/apimachinery/pkg/apis/testapigroup/v1/generated.pb.go	500	141	1
func() in staging/src/k8s.io/apiserver/pkg/endpoints/installer.go	708	129	1
func() in staging/src/k8s.io/api/admissionregistration/v1/generated.pb.go	438	125	1
func() in staging/src/k8s.io/api/admissionregistration/v1beta1/generated.pb.go	438	125	1
func() in staging/src/k8s.io/api/batch/v1/generated.pb.go	402	117	1
func() in staging/src/k8s.io/api/discovery/v1/generated.pb.go	412	116	1
func() in staging/src/k8s.io/api/admissionregistration/v1/generated.pb.go	405	116	1
func() in staging/src/k8s.io/api/admissionregistration/v1beta1/generated.pb.go	405	116	1
func() in staging/src/k8s.io/kubelet/pkg/apis/deviceplugin/v1beta1/api.pb.go	405	113	1
func ValidateCustomResourceDefinitionOpenAPISchema() in staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/validation/validation.go	242	113	6
func() in staging/src/k8s.io/client-go/informers/generic.go	227	112	1
func() in staging/src/k8s.io/api/apps/v1/generated.pb.go	380	112	1
func() in staging/src/k8s.io/api/apps/v1beta1/generated.pb.go	380	112	1
func() in staging/src/k8s.io/api/apps/v1beta2/generated.pb.go	380	112	1
func() in staging/src/k8s.io/api/storage/v1/generated.pb.go	394	110	1
func() in staging/src/k8s.io/api/storage/v1beta1/generated.pb.go	394	110	1
func() in staging/src/k8s.io/api/certificates/v1/generated.pb.go	392	110	1
func() in staging/src/k8s.io/api/certificates/v1beta1/generated.pb.go	393	110	1
func() in staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1/generated.pb.go	375	109	1
func() in staging/src/k8s.io/api/discovery/v1beta1/generated.pb.go	379	107	1
func() in staging/src/k8s.io/api/batch/v1/generated.pb.go	353	104	1
func() in staging/src/k8s.io/kubelet/pkg/apis/deviceplugin/v1alpha/api.pb.go	371	103	1
func ValidateKubeletConfiguration() in pkg/kubelet/apis/config/validation/validation.go	223	103	2
func() in staging/src/k8s.io/api/admission/v1/generated.pb.go	363	102	1
func() in staging/src/k8s.io/api/admission/v1beta1/generated.pb.go	363	102	1
func() in staging/src/k8s.io/api/authorization/v1/generated.pb.go	346	98	1
func() in staging/src/k8s.io/api/authorization/v1beta1/generated.pb.go	346	98	1
func SetObjectDefaults_Pod() in pkg/apis/core/v1/zz_generated.defaults.go	291	95	1
func() in pkg/proxy/ipvs/proxier.go	459	93	1
func() in pkg/proxy/iptables/proxier.go	534	93	1
func() in staging/src/k8s.io/apiserver/pkg/apis/audit/v1/generated.pb.go	328	92	1
func RegisterConversions() in pkg/apis/extensions/v1beta1/zz_generated.conversion.go	453	91	1
func SetObjectDefaults_StatefulSet() in pkg/apis/apps/v1/zz_generated.defaults.go	276	90	1
func SetObjectDefaults_StatefulSet() in pkg/apis/apps/v1beta1/zz_generated.defaults.go	276	90	1
func SetObjectDefaults_StatefulSet() in pkg/apis/apps/v1beta2/zz_generated.defaults.go	276	90	1
func SetObjectDefaults_ReplicationController() in pkg/apis/core/v1/zz_generated.defaults.go	269	90	1
func() in staging/src/k8s.io/api/policy/v1/generated.pb.go	307	89	1
func() in staging/src/k8s.io/api/policy/v1beta1/generated.pb.go	307	89	1
func SetObjectDefaults_DaemonSet() in pkg/apis/apps/v1/zz_generated.defaults.go	267	89	1
func SetObjectDefaults_Deployment() in pkg/apis/apps/v1/zz_generated.defaults.go	267	89	1