docs(obseve): Adding Volume Assertion Guide #21699

Job	Run time
build (./gradlew build -x :metadata-ingestion:build -x :metadata-ingestion:check -x docs-website:...	17m 22s
build (./gradlew build -x :metadata-ingestion:build -x :metadata-ingestion:check -x docs-website:...	17m 46s
build (./gradlew :datahub-frontend:build :datahub-web-react:build --parallel, UTC)	26m 47s
build (./gradlew :datahub-frontend:build :datahub-web-react:build --parallel, America/New_York)	28m 12s
build (./gradlew :metadata-ingestion-modules:airflow-plugin:build --parallel, UTC)	5m 50s
build (./gradlew :metadata-ingestion-modules:airflow-plugin:build --parallel, America/New_York)	6m 43s
event-file	3s
quickstart-compose-validation	20s
	1h 43m 3s

Provide feedback