Add documentation for SSO (#2940)

* Add documentation for SSO

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* added content

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* technical review changes

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* Apply suggestions from doc review

Co-authored-by: Caroline <113052567+carolxob@users.noreply.github.com>

* Made further doc review changes

Signed-off-by: ariamarble <armarble@amazon.com>

* Apply suggestions from editorial review

Co-authored-by: Nathan Bower <nbower@amazon.com>

* Made editorial changes

Signed-off-by: ariamarble <armarble@amazon.com>

* Apply further suggestions from editorial review

Co-authored-by: Nathan Bower <nbower@amazon.com>

* case changing

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* sentence re-write

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* quick link fix

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Signed-off-by: ariamarble <armarble@amazon.com>
Co-authored-by: Caroline <113052567+carolxob@users.noreply.github.com>
Co-authored-by: Nathan Bower <nbower@amazon.com>

_observing-your-data/sso.md

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+---
+layout: default
+title: Simple Schema for Observability
+nav_order: 120
+---
+
+# Simple Schema for Observability
+Introduced 2.6
+{: .label .label-purple }
+
+OpenSearch 2.6 introduced a standardization for conforming to a common and unified observability schema: Simple Schema for Observability (SSO). [Observability]({{site.url}}{{site.baseurl}}/observing-your-data/index/) is a collection of plugins and applications that let you visualize data-driven events by using Piped Processing Language (PPL) to explore and query data stored in OpenSearch.
+
+With the schema in place, Observability tools can ingest, automatically extract, and aggregate data and create custom dashboards, making it easier to understand the system at a higher level.
+
+SSO is inspired by both [OpenTelemetry](https://opentelemetry.io/docs/) and the Elastic Common Schema (ECS) and uses Amazon Elastic Container Service ([Amazon ECS](https://docs.aws.amazon.com/AmazonECS/latest/developerguide/ecs_cwe_events.html)) event logs and OpenTelemetry metadata.
+
+Alerts will be supported in a future release.
+{: .note }
+
+## Use cases
+
+Use cases for SSO include:
+
+* Ingesting observability data from different data types.
+* Moving from proprietary configurations that are non-transferable to a consolidated, sharable observability solution that allows users to ingest and display an analysis of any type of telemetry data from any type of provider.
+
+Data Prepper conforms to the SSO schema for metrics and will gradually support traces and logs.
+
+Data Prepper's [trace mapping]({{site.url}}{{site.baseurl}}/data-prepper/common-use-cases/trace-analytics/) currently provides `service-map` data in a different way than SSO traces. To make the trace mapping compatible with Observability, it will be integrated with the SSO traces schema and will introduce `service-map` as an enriched field.
+{: .note }
+
+## Traces and metrics
+
+Schema definitions for traces and metrics are defined and supported by the Observability plugin.
+
+These schema definitions include:
+
+- The index structure (mapping).
+- The [index naming conventions](https://github.com/opensearch-project/observability/issues/1405).
+- A JSON schema for enforcement and validation of the structure.
+- The [integration](https://github.com/opensearch-project/OpenSearch-Dashboards/issues/3412) feature for adding preconfigured dashboards and assets.