Asserting Observation keys and value should offer suggestions from the other cardinality bucket.

[osi]

Please describe the feature request.

When using #hasLowCardinalityKeyValue or #hasHighCardinalityKeyValue, if the key is not found, in addition to listing all the possible keys with the same cardinality, it should print the keys with the differing cardinality.

Rationale

There are two types of mistakes possible in writing an assertion:

• Correct cardinality, wrong key name
• Wrong cardinality, correct key name

The current error message only helps with the first case.

[marcingrzejszczak]

Great idea! Are you willing to file a PR?

[izeye]

I created #4768 to try to resolve this.