Add Fleet and Elastic Agent terminology to glossary (elastic#1637)

Author: bmorelli25

docs/en/glossary/glossary.asciidoc

@@ -25,6 +25,13 @@ ZooKeeper to {es}.
 include::{kib-repo-dir}/glossary.asciidoc[tag=advanced-settings-def]
 --
 
+[[glossary-agent-policy]] Agent policy::
+A collection of inputs and settings that defines the data to be collected by {agent}.
+An agent policy can be applied to a single agent or shared by a group of agents;
+this makes it easier to manage many agents at scale.
+See {fleet-guide}/agent-policy.html[{agent} policies].
+//Source: Observability
+
 [[glossary-allocator]] allocator::
 Manages hosts that contain {es} and {kib} nodes. Controls the lifecycle of these
 nodes by creating new <<glossary-container,containers>> and managing the nodes
@@ -260,9 +267,9 @@ include::{es-repo-dir}/glossary.asciidoc[tag=ccs-def]
 --
 
 [[glossary-custom-rules]] custom rules::
-A set of conditions and actions that change the behavior of {anomaly-jobs}. You 
+A set of conditions and actions that change the behavior of {anomaly-jobs}. You
 can also use filters to further limit the scope of the rules. See
-{ml-docs}/ml-rules.html[Custom rules]. {kib} refers to custom rules as job 
+{ml-docs}/ml-rules.html[Custom rules]. {kib} refers to custom rules as job
 rules.
 //Source: Machine learning
 
@@ -281,6 +288,12 @@ include::{kib-repo-dir}/glossary.asciidoc[tag=dashboard-def]
 real time. {dfeeds-cap} retrieve data from {es} for analysis.
 //Source: X-Pack
 
+[[glossary-dataset]] dataset::
+A collection of data that has the same structure.
+The name of a dataset typically signifies its source.
+See {fleet-guide}/data-streams.html[data stream naming scheme].
+//Source: Observability
+
 [[glossary-dataframe-job]] {dfanalytics-job}::
 {dfanalytics-jobs-cap} contain the configuration information and metadata
 necessary to perform {ml} analytics tasks on a source index and store the
@@ -358,6 +371,11 @@ include::{es-repo-dir}/glossary.asciidoc[tag=document-def]
 include::{kib-repo-dir}/glossary.asciidoc[tag=edge-def]
 --
 
+[[glossary-{agent}]] {agent}::
+A single, unified agent that you can deploy to hosts or containers to collect data and protect endpoints.
+See {fleet-guide}/fleet-overview.html[{agent} overview].
+//Source: Observability
+
 [[glossary-ecs]] Elastic Common Schema (ECS)::
 A document schema for Elasticsearch, for use cases such as logging and metrics.
 ECS defines a common set of fields, their datatype, and gives guidance on their
@@ -370,6 +388,11 @@ different sources.
 include::{kib-repo-dir}/glossary.asciidoc[tag=ems-def]
 --
 
+[[glossary-epr]] Elastic Package Registry (EPR)::
+A service hosted by Elastic that stores Elastic package definitions in a central ___location.
+See the https://github.com/elastic/package-registry[EPR GitHub repository].
+//Source: Observability
+
 [[glossary-element]] element::
 +
 --
@@ -454,6 +477,16 @@ depending on the characteristics of the event. Popular filter plugins include
 grok, mutate, drop, clone, and geoip. Filter stages are optional.
 //Source: Logstash
 
+[[glossary-fleet]] Fleet::
+Fleet provides a way to centrally manage {agent}s at scale. There are two parts: The Fleet app in {kib} provides a web-based UI to add and remotely manage agents, while the {fleet-server} provides the backend service that manages agents.
+See {fleet-guide}/fleet-overview.html[{agent} overview].
+//Source: Observability
+
+[[glossary-{fleet-server}]] {fleet-server}::
+{fleet-server} is a component used to centrally manage {agent}s.
+It serves as a control plane for updating agent policies, collecting status information, and coordinating actions across agents.
+//Source: Observability
+
 [[glossary-flush]] flush::
 +
 --
@@ -622,20 +655,20 @@ order to index <<glossary-event,event>> data.
 //Source: Logstash
 
 [[glossary-inference]] inference::
-A {ml} feature that enables you to use supervised learning processes – like 
-{regression} and {classification} – in a continuous fashion by using 
+A {ml} feature that enables you to use supervised learning processes – like
+{regression} and {classification} – in a continuous fashion by using
 <<glossary-trained-model,trained models>> against incoming data.
 //Source: Machine learning
 
 [[glossary-inference-aggregation]] inference aggregation::
-A pipeline aggregation that references a <<glossary-trained-model>> in an 
-aggregation to infer on the results field of the parent bucket aggregation. It 
+A pipeline aggregation that references a <<glossary-trained-model>> in an
+aggregation to infer on the results field of the parent bucket aggregation. It
 enables you to use supervised {ml} at search time.
 //Source: Machine learning
 
 [[glossary-inference-processor]] inference processor::
-A processor specified in an ingest pipeline that uses a 
-<<glossary-trained-model>> to infer against the data that is being ingested in 
+A processor specified in an ingest pipeline that uses a
+<<glossary-trained-model>> to infer against the data that is being ingested in
 the pipeline.
 //Source: Machine learning
 
@@ -662,8 +695,15 @@ Code is considered instrumented when it collects and reports this performance da
 //Source: Observability
 
 [[glossary-integration]] integration::
-Out-of-the-box configurations for common data sources to simplify the collection,
-parsing, and visualization of logs and metrics. Also known as a <<glossary-module,module>>.
+
+An easy way for external systems to connect to the {stack}.
+Whether it's collecting data or protecting systems from security threats,
+integrations provide out-of-the-box assets to make setup easy--many with just a single click.
+//Source: Observability
+
+[[glossary-integration-policy]] integration policy::
+An instance of an <<glossary-integration,integration>> that is configured for a specific use case,
+such as collecting logs from a specific file.
 //Source: Observability
 
 [discrete]
@@ -778,7 +818,7 @@ statements.
 
 [[glossary-module]] module::
 Out-of-the-box configurations for common data sources to simplify the collection,
-parsing, and visualization of logs and metrics. Also known as an <<glossary-integration,integration>>.
+parsing, and visualization of logs and metrics.
 //Source: Observability
 
 [[glossary-monitor]] monitor::
@@ -790,6 +830,11 @@ applications and services.
 [[n-glos]]
 === N
 
+[[glossary-namespace]] namespace::
+A user-configurable arbitrary data grouping, such as an environment (`dev`, `prod`, or `qa`),
+a team, or a strategic business unit.
+//Source: Observability
+
 [[glossary-node]] node::
 +
 --
@@ -1102,6 +1147,12 @@ and can have a parent/child relationship with other spans.
 include::{es-repo-dir}/glossary.asciidoc[tag=split-def]
 --
 
+[[glossary-standalone]] standalone::
+This mode allows manual configuration and management of {agent}s locally
+on the systems where they are installed.
+See {fleet-guide}/run-elastic-agent-standalone.html[Run {agent} standalone].
+//Source: Observability
+
 [[glossary-stunnel]] stunnel::
 Securely tunnels all traffic in an {ece} installation.
 //Source: Cloud
@@ -1183,9 +1234,9 @@ include::{kib-repo-dir}/glossary.asciidoc[tag=tracks-def]
 --
 
 [[glossary-trained-model]] trained model::
-A {ml} model that is trained and tested against a labelled data set and can be 
-referenced in an ingest pipeline or in a pipeline aggregation to perform 
-{classification} or {reganalysis} on new data. See 
+A {ml} model that is trained and tested against a labelled data set and can be
+referenced in an ingest pipeline or in a pipeline aggregation to perform
+{classification} or {reganalysis} on new data. See
 {ml-docs}/ml-trained-models.html[Trained models].
 //Source: Machine learning