Merge branch 'master' into release-1.9

_data/glossary/annotation.yaml

@@ -0,0 +1,9 @@
+id: annotation
+name: Annotation
+full-link: docs/concepts/overview/working-with-objects/annotations
+tags:
+- fundamental
+short-description: >
+  A key-value pair that is used to attach arbitrary non-identifying metadata to objects.
+long-description: >
+  The metadata in an annotation can be small or large, structured or unstructured, and can include characters not permitted by labels. Clients such as tools and libraries can retrieve this metadata.

_data/glossary/horizontal-pod-autoscaler.yaml

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+id: horizontal-pod-autoscaler
+name: Horizontal Pod Autoscaler
+full-link: /docs/tasks/run-application/horizontal-pod-autoscale/
+aka:
+- HPA
+related:
+- pod
+tags:
+- operation
+short-description: >
+  An API resource that automatically scales the number of pod replicas based on targeted CPU
+  utilization or custom metric targets.
+long-description: >
+  HPA is typically used with replication controllers, deployments or replica sets and cannot be
+  applied to objects that cannot be scaled, for example DaemonSets.  

_data/glossary/labels.yaml

@@ -0,0 +1,9 @@
+id: labels
+name: Labels
+full-link: /docs/concepts/overview/working-with-objects/labels
+tags:
+- fundamental
+short-description: >
+  Used to tag objects with identifying attributes that are meaningful and relevant to users.
+long-description: >
+  Labels are key/value pairs that are attached to objects, such as pods. They can be used to organize and to select subsets of objects.