data observability: document attribute queries in monitor docs

[kevinzenghu]

What does this PR do? What is the motivation?

Expands the Data Observability monitor Choose data to monitor docs to cover search capabilities that were already supported in the product but undocumented, and tidies up that section. This PR:

• Documents tag filters — filter on any tag applied to your assets, using the tag key as the filter key (for example, owner, platform, environment), with the same wildcard and quoting support as name filters.
• Documents the lineage_score computed attribute — bucketed into the discrete tiers 0.00, 0.10, 0.30, 0.50, 0.70, 0.90, and 1.00 (the only computed attribute available today). You can match one tier or combine tiers with OR (for example, lineage_score:(0.90 OR 1.00) for the top two tiers).
• Documents the lineage relationship filter — explains Add Lineage Filter, which scopes a selection to assets that are Upstream of or Downstream of another asset (for example, every table upstream of a critical dashboard).
• Updates the "Choose data to monitor" screenshot to show the lineage relationship filter row, and updates its alt text accordingly.
• Removes the "Source tab" query-format section, which exposed internal query syntax (search for [ENTITY_TYPE] where ...) that users don't need.

Motivation: this came up in #data-observability-feedback — the syntax for attribute queries and the lineage filter had never been documented.

Merge instructions

Merge readiness:

• Ready for merge

Additional notes

Scope is limited to the existing Choose data to monitor section; no other pages change. lineage_score is the only computed attribute today. It is not continuous — the entity-scorer rounds each asset up to one of seven percentile tiers (0.00, 0.10, 0.30, 0.50, 0.70, 0.90, 1.00), where higher means more downstream dependents.

[github-actions]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/kevinzenghu/document-aastra-attribute-queries/monitors/types/data_observability

[drichards-87]

Left a couple of suggestions and approved the PR.

[datadog-datadog-prod-us1-2]

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