Update README.md

[srinibddog]

What does this PR do?

Provides additional information about Custom Queries. Adds the key configuration information number of columns from the query should equal the number of custom query metrics in the conf.yaml file

Motivation

This information is not present in the documentation, rather in the example conf.yaml file.
This makes it easy to read from the documentation

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• [x ] Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[brett0000FF]

Suggested change

	Custom Query is used to get specific fields from the database to be used a custom metrics.
	Custom Query is used to extract specific fields from the database to be used as custom metrics.

[brett0000FF]

Suggested change

	The **number of columns** Output from the Custom Query should be **equal to to number of metrics variables** in the conf.yaml file shown below.
	The **number of columns** output from the Custom Query should be equal to to number of metrics variables in the `conf.yaml` file shown below.

[github-actions]

⚠️ Recommendation: Add qa/skip-qa Label

This PR does not modify any files shipped with the agent.

To help streamline the release process, please consider adding the qa/skip-qa label if these changes do not require QA testing.

[pierreln-dd]

/merge

[dd-devflow-routing-codex]

View all feedbacks in Devflow UI.

2025-09-23 07:46:34 UTC ℹ️ Start processing command /merge

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2025-09-23 11:47:05 UTC ⚠️ MergeQueue: This merge request was unqueued

devflow unqueued this merge request: It did not become mergeable within the expected time

[sethsamuel]

Thanks for the contribution, the Oracle integration has moved to https://github.com/DataDog/datadog-agent/tree/main/pkg/collector/corechecks/oracle and this version is no longer maintained.