feat: Upgrade to Kubernetes 1.21

Kubernetes dependencies are upgraded to the latest 1.21 release.

A module replacement for github.com/golang/protobuf to facilitate
skycfg functionality has been commented out as well, in the hopes that
things are working almost two years on. Unfortunately, the root skycfg
issue remains open. In the meantime, Segment has ceased experimenting
with it.

Author: bhavanki

README.md

@@ -206,8 +206,7 @@ Kubernetes structs (from [Protocol Buffers](https://developers.google.com/protoc
 so it can provide more structure and less repetition than YAML-based sources. See
 [this file](/examples/kubeapply-test-cluster/profile/apps/redis/deployment.star) for an example.
 
-The skycfg support in `kubeapply` should be considered experimental. We're using it for
-a few test services in Segment, but it has not been widely exercised internally.
+The skycfg support in `kubeapply` is experimental and unsupported.
 
 ### Expanded configs
 

go.mod

@@ -31,13 +31,13 @@ require (
 	go.starlark.net v0.0.0-20201204201740-42d4f566359b
 	golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d
 	gopkg.in/src-d/go-git.v4 v4.13.1
-	gopkg.in/yaml.v2 v2.3.0
+	gopkg.in/yaml.v2 v2.4.0
 	gopkg.in/zorkian/go-datadog-api.v2 v2.28.0
-	k8s.io/api v0.20.2
-	k8s.io/apimachinery v0.20.2
-	k8s.io/client-go v0.20.2
-	k8s.io/klog/v2 v2.4.0
-	k8s.io/kubectl v0.20.2
+	k8s.io/api v0.21.14
+	k8s.io/apimachinery v0.21.14
+	k8s.io/client-go v0.21.14
+	k8s.io/klog/v2 v2.9.0
+	k8s.io/kubectl v0.21.14
 )
 
 require (
@@ -47,8 +47,9 @@ require (
 	github.com/cenkalti/backoff v2.2.1+incompatible // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/emirpasic/gods v1.12.0 // indirect
-	github.com/go-logr/logr v0.2.0 // indirect
-	github.com/golang/protobuf v1.4.3 // indirect
+	github.com/go-logr/logr v0.4.0 // indirect
+	github.com/golang/protobuf v1.5.0 // indirect
+	github.com/google/go-cmp v0.5.5 // indirect
 	github.com/google/go-querystring v1.0.0 // indirect
 	github.com/google/gofuzz v1.1.0 // indirect
 	github.com/google/uuid v1.1.2 // indirect
@@ -61,7 +62,6 @@ require (
 	github.com/json-iterator/go v1.1.10 // indirect
 	github.com/kevinburke/ssh_config v0.0.0-20190725054713-01f96b0aa0cd // indirect
 	github.com/konsorten/go-windows-terminal-sequences v1.0.3 // indirect
-	github.com/kr/text v0.2.0 // indirect
 	github.com/mattn/go-colorable v0.1.4 // indirect
 	github.com/mattn/go-isatty v0.0.11 // indirect
 	github.com/mattn/go-runewidth v0.0.9 // indirect
@@ -71,13 +71,12 @@ require (
 	github.com/mitchellh/reflectwalk v1.0.0 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.1 // indirect
-	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/rcrowley/go-metrics v0.0.0-20200313005456-10cdbea86bc0 // indirect
 	github.com/segmentio/asm v1.1.3 // indirect
 	github.com/segmentio/go-snakecase v1.1.0 // indirect
 	github.com/segmentio/objconv v1.0.1 // indirect
-	github.com/sergi/go-diff v1.0.0 // indirect
+	github.com/sergi/go-diff v1.1.0 // indirect
 	github.com/shopspring/decimal v1.2.0 // indirect
 	github.com/spf13/cast v1.3.1 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
@@ -88,24 +87,26 @@ require (
 	github.com/xeipuuv/gojsonschema v1.2.0 // indirect
 	github.com/yashtewari/glob-intersection v0.0.0-20180916065949-5c77d914dd0b // indirect
 	github.com/zorkian/go-datadog-api v2.28.0+incompatible // indirect
-	golang.org/x/crypto v0.0.0-20201002170205-7f63de1d35b0 // indirect
-	golang.org/x/net v0.0.0-20201110031124-69a78807bb2b // indirect
+	golang.org/x/crypto v0.0.0-20211202192323-5770296d904e // indirect
+	golang.org/x/net v0.0.0-20211209124913-491a49abca63 // indirect
 	golang.org/x/sys v0.0.0-20211110154304-99a53858aa08 // indirect
-	golang.org/x/text v0.3.4 // indirect
-	golang.org/x/time v0.0.0-20200630173020-3af7569d3a1e // indirect
+	golang.org/x/term v0.0.0-20210220032956-6a3ed077a48d // indirect
+	golang.org/x/text v0.3.6 // indirect
+	golang.org/x/time v0.0.0-20210220033141-f8bda1e9f3ba // indirect
 	google.golang.org/appengine v1.6.5 // indirect
-	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
+	google.golang.org/protobuf v1.26.0 // indirect
 	gopkg.in/go-playground/assert.v1 v1.2.1 // indirect
 	gopkg.in/go-playground/mold.v2 v2.2.0 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/src-d/go-billy.v4 v4.3.2 // indirect
 	gopkg.in/validator.v2 v2.0.0-20180514200540-135c24b11c19 // indirect
 	gopkg.in/warnings.v0 v0.1.2 // indirect
 	gopkg.in/yaml.v3 v3.0.0-20200601152816-913338de1bd2 // indirect
-	k8s.io/utils v0.0.0-20201110183641-67b214c5f920 // indirect
-	sigs.k8s.io/structured-merge-diff/v4 v4.0.2 // indirect
+	k8s.io/utils v0.0.0-20211116205334-6203023598ed // indirect
+	sigs.k8s.io/structured-merge-diff/v4 v4.2.1 // indirect
 	sigs.k8s.io/yaml v1.2.0 // indirect
 )
 
-// Need to pin to older version to get around https://github.com/stripe/skycfg/issues/86.
-replace github.com/golang/protobuf v1.4.3 => github.com/golang/protobuf v1.3.2
+// For problems with skycfg, try rebuilding with this replacement.
+// Reference: https://github.com/stripe/skycfg/issues/86
+// replace github.com/golang/protobuf v1.5.0 => github.com/golang/protobuf v1.3.2