[Postgresql] Add alias field for database.oid

[niraj-elastic]

• Enhancement

What does this PR do?

There are 3 datasets in Postgresql and all three have OID fields under different field names.

• postgresql.activity.database.oid
• postgresql.database.oid
• postgresql.statement.database.oid

User should be able to associate data across these 3 datasets using these OID's.

To solve this issue we have added database.oid field as alias fild to all the above fields

Related issue

• [Postgresql] Association of metrics across Postgresql Datasets using OID #6765

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

[milan-elastic]

LGTM

[elasticmachine]

🚀 Benchmarks report

To see the full report comment with /test benchmark fullreport

[ishleenk17]

Please check if we can use field aliasing here.
Alias all these 3 fields in datastream to database.oid.

[ishleenk17]

Changes looks good.

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 33ba9cc

History

• 💚 Build #10961 succeeded 61e37e1
• 💚 Build #10755 succeeded f1bbc8b

[elastic-sonarqube]

Quality Gate passed

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0 Fixed issues
0 Accepted issues

Measures
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[elasticmachine]

Package postgresql - 1.20.0 containing this change is available at https://epr.elastic.co/search?package=postgresql