#### Continuous Improvement
- Project sustainability is not just about features. Many SIGs have been working on  improving test coverage, ensuring the basics stay reliable, and stability of the core feature set and working on maturing existing features and cleaning up the backlog.

#### Extensibility

$columns {\n      .col#{$infix}-#{$i} {\n        @extend %grid-column;\n      }\n    }\n    .col#{$infix},\n    .col#{$infix}-auto {\n      @extend %grid-column;\n    }\n\n    @include media-breakpoint-up($breakpoint, $breakpoints) {\n      // Provide basic `.col-{bp}` classes for equal-width flexbox columns\n      .col#{$infix} {\n        flex-basis: 0;\n        flex-grow: 1;\n        max-width: 100%;\n      }\n\n      @for $i from 1 through $grid-row-columns {\n        .row-cols#{$infix}-#{$i} {\n ...

.col#{$infix}-#{$i} {\n          @extend %grid-column;\n        }\n      }\n    }\n\n    .col#{$infix},\n    .col#{$infix}-auto {\n      @extend %grid-column;\n    }\n\n    @include media-breakpoint-up($breakpoint, $breakpoints) {\n      // Provide basic `.col-{bp}` classes for equal-width flexbox columns\n      .col#{$infix} {\n        flex-basis: 0;\n        flex-grow: 1;\n        max-width: 100%;\n      }\n\n      @if $grid-row-columns > 0 {\n        @for $i from 1 through $grid-row-columns {\n...

        * Use StatefulSet for Elasticsearch instead of ReplicationController, with persistent volume claims
        * Require authenticating towards Elasticsearch, as Elasticsearch 5.5 by default requires basic authentication
* Rebase hyperkube image on debian-hyperkube-base, based on debian-base. ([#48365](https://github.com/kubernetes/kubernetes/pull/48365), [@ixdy](https://github.com/ixdy))

* Initial basic bootstrap-checkpoint support ([#50984](https://github.com/kubernetes/kubernetes/pull/50984), [@timothysc](https://github.com/timothysc))

Additionally, these Kubernetes snapshot primitives act as basic building blocks that unlock the ability to develop advanced, enterprise-grade, storage administration features for Kubernetes: including application or cluster level backup solutions.

glist = \ javax.microedition.pki,\ javax.security.auth.x500 J2SE-1.2.pkglist = \ javax.accessibility,\ javax.swing,\ javax.swing.border,\ javax.swing.colorchooser,\ javax.swing.event,\ javax.swing.filechooser,\ javax.swing.plaf,\ javax.swing.plaf.basic,\ javax.swing.plaf.metal,\ javax.swing.plaf.multi,\ javax.swing.table,\ javax.swing.text,\ javax.swing.text.html,\ javax.swing.text.html.parser,\ javax.swing.text.rtf,\ javax.swing.tree,\ javax.swing.undo,\ org.omg.CORBA,\ org.omg.CORBA.DynAnyPackage,\...

.col#{$infix}-#{$i} {\n          @extend %grid-column;\n        }\n      }\n    }\n\n    .col#{$infix},\n    .col#{$infix}-auto {\n      @extend %grid-column;\n    }\n\n    @include media-breakpoint-up($breakpoint, $breakpoints) {\n      // Provide basic `.col-{bp}` classes for equal-width flexbox columns\n      .col#{$infix} {\n        flex-basis: 0;\n        flex-grow: 1;\n        max-width: 100%;\n      }\n\n      @if $grid-row-columns > 0 {\n        @for $i from 1 through $grid-row-columns {\n...