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Related PR: https://github.com/kubernetes/kubernetes/pull/30313 PR #30313 fixed duplicate errors for invalid aggregate errors in https://github.com/kubernetes/kubernetes/blob/master/pkg/kubectl/cmd/util/helpers.go However, duplicate aggregate errors that went through https://github.com/kubernetes/kubernetes/blob/master/pkg/util/validation/field/errors.go were not affected by that patch. This patch adds duplicate aggregate error checking to `pkg/util/validation/field/errors.go` \##### Before `$ kubectl set env rc/idling-echo-1 test-abc=1234` ``` error: ReplicationController "idling-echo-1" is invalid: [spec.template.spec.containers[0].env[0].name: Invalid value: "test-abc": must be a C identifier (matching regex [A-Za-z_][A-Za-z0-9_]*): e.g. "my_name" or "MyName", spec.template.spec.containers[1].env[0].name: Invalid value: "test-abc": must be a C identifier (matching regex [A-Za-z_][A-Za-z0-9_]*): e.g. "my_name" or "MyName", spec.template.spec.containers[0].env[0].name: Invalid value: "test-abc": must be a C identifier (matching regex [A-Za-z_][A-Za-z0-9_]*): e.g. "my_name" or "MyName", spec.template.spec.containers[1].env[0].name: Invalid value: "test-abc": must be a C identifier (matching regex [A-Za-z_][A-Za-z0-9_]*): e.g. "my_name" or "MyName"] ``` `$ kubectl set env rc/node-1 test-abc=1234` ``` error: ReplicationController "idling-echo-1" is invalid: [spec.template.spec.containers[0].env[0].name: Invalid value: "test-abc": must be a C identifier (matching regex [A-Za-z_][A-Za-z0-9_]*): e.g. "my_name" or "MyName", spec.template.spec.containers[1].env[0].name: Invalid value: "test-abc": must be a C identifier (matching regex [A-Za-z_][A-Za-z0-9_]*): e.g. "my_name" or "MyName"] ``` \##### After `$ kubectl set env rc/idling-echo-1 test-abc=1234` ``` error: ReplicationController "idling-echo-1" is invalid: [spec.template.spec.containers[0].env[0].name: Invalid value: "test-abc": must be a C identifier (matching regex [A-Za-z_][A-Za-z0-9_]*): e.g. "my_name" or "MyName", spec.template.spec.containers[1].env[0].name: Invalid value: "test-abc": must be a C identifier (matching regex [A-Za-z_][A-Za-z0-9_]*): e.g. "my_name" or "MyName"] ``` `$ kubectl set env rc/node-1 test-abc=1234` ``` error: ReplicationController "node-1" is invalid: spec.template.spec.containers[0].env[0].name: Invalid value: "test-abc": must be a C identifier (matching regex [A-Za-z_][A-Za-z0-9_]*): e.g. "my_name" or "MyName" ```