Redis health check reports an error when redis_version is missing from the INFO response

[youngledo]

Currently, the health check details displayed for Redis are as follows:

But, the health check will report an error when different Redis distributions return different information.

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To avoid this issue, when enabling "always" or "when_authorized" it's preferable to display all details rather than just the version number:

management.endpoint.health.show-details=always | when_authorized

This issue might also exist in older versions and may require a backport.
Similarly, other component distributions may also have similar issues.

[wilkinsona]

For future reference, from the docs for the INFO command:

Please note depending on the version of Redis some of the fields have been added or removed. A robust client application should therefore parse the result of this command by skipping unknown properties, and gracefully handle missing fields.

So it's reasonable for us to start gracefully handling the missing redis_version field, even though it appears it really should be there for Redis 2.4 and later.

[wilkinsona]

Thanks very much, @youngledo.