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Breaking changes v13 - labels as arguments considered as object #499

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nirapx opened this issue Mar 28, 2022 · 2 comments · May be fixed by #553
Open

Breaking changes v13 - labels as arguments considered as object #499

nirapx opened this issue Mar 28, 2022 · 2 comments · May be fixed by #553
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@zbjornson
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@nirapx
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nirapx commented Mar 28, 2022 •
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Hi,
When I'm setting labels as arguments and the first argument is an array:

someCounter.labels(arr, string1, string2)

it is considered as an object and throws Added label "0" is not included in initial labelset.
I found that there is a condition if (typeof args[0] === 'object') but it might also check that it is not an array.

I've upgraded from v12 to v14 (but it happens in v13 also).

Thanks
@zbjornson
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I don't think I understand what the use case and expectation are here. metric.labels() is supposed to accept an object of key-value pairs, or a series of strings that match up one-to-one with the metric's label names. An array shouldn't be passed here. Can you clarify please?

@nirapx
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nirapx commented Mar 29, 2022

Yes.
When we used this library in v12 we could pass just arguments such as metric.labels(arg1, arg2, arg3).
One of the args was an array: metrics.labels(arr, arg2, arg3).
After upgrading to v13/14 the ability to pass an object was added also and as a result, the code above was broken.

The new code checks if the type of the first argument is an object but it returns true for array also.

zbjornson added a commit that referenced this issue Mar 11, 2023
@zbjornson
bug: support array argument to labels() again
3009d92 
This was undocumented and untested, and broke in 13.1.0.

Fixes #499
@zbjornson zbjornson linked a pull request Mar 11, 2023 that will close this issue
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@zbjornson zbjornson self-assigned this Mar 11, 2023
zbjornson added a commit that referenced this issue Mar 11, 2023
@zbjornson
bug: support array argument to labels() again
ab207ef 
This was undocumented and untested, and broke in 13.1.0.

Fixes #499
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bug: support array argument to labels() again siimon/prom-client
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@zbjornson @nirapx