Add endpoint to proxy requests to grafana's proxy endpoint
What does this MR do?
Adds a client and endpoint for interacting with Grafana datasources. It's actually a proxy-chain! Our FE will* call this endpoint, which will call a Grafana proxy endpoint (with delayed jobs & reactive cache), which will call a prometheus instance.
This will enable us to fetch the data for embedding grafana-configured metrics within GFM. Related Issue: #31376 (closed)
*Utilization of this endpoint will come in another MR.
Screenshots
Does this MR meet the acceptance criteria?
Conformity
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Changelog entry - [n/a] Documentation created/updated or follow-up review issue created
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Code review guidelines -
Merge request performance guidelines -
Style guides - [n/a] Database guides
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Separation of EE specific content
Performance and Testing
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Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process. -
Tested in all supported browsers
Security
If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:
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Label as security and @ mention @gitlab-com/gl-security/appsec
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The MR includes necessary changes to maintain consistency between UI, API, email, or other methods -
Security reports checked/validated by a reviewer from the AppSec team