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Salva Corts 15af77ba83 Remove Prometheus dependency for push pkg (#9937) ... **What this PR does / why we need it**: In https://github.com/grafana/loki/pull/9694, we modified the `push` pkg to import Prometheus as a dependency to use the `labels.Labels` type for the entries' non-indexed labels. Having Prometheus as a dependency is problematic since any project importing the `push` pkg will need to import Prometheus as a result. In fact, this is one of the reasons why the `push` pkg was extracted from Loki in the first place (https://github.com/grafana/loki/pull/8259). This PR removes the dependency of Prometheus from the `push` pkg by copying some bits of the implementation for Prometheus' `labels.Labels`. We copy: - The Labels struct definition - The JSON Marshaling and Unmarshaling methods for the labels. We need this so labels are encoded as maps instead of an array of objects. --- **Notes for reviewers:** - To implement the JSON Marshaling and Unmarshaling methods the `push` pkg now depends on `golang.org/x/exp`. I think it should be fine for projects importing the `push` pkg to also depend on `golang.org/x/exp`, right?		3 years ago
..
legacy	Remove Prometheus dependency for push pkg (#9937)	3 years ago
unmarshal.go	Add metadata to push payload (#9694)	3 years ago
unmarshal_test.go	Remove Prometheus dependency for push pkg (#9937)	3 years ago