[k159] Remove Prometheus dependency for push pkg #9956
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**What this PR does / why we need it**: In #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 (#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? (cherry picked from commit 15af77b)
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Backport 15af77b from #9937
What this PR does / why we need it:
In #9694, we modified the
pushpkg to import Prometheus as a dependency to use thelabels.Labelstype for the entries' non-indexed labels.Having Prometheus as a dependency is problematic since any project importing the
pushpkg will need to import Prometheus as a result. In fact, this is one of the reasons why thepushpkg was extracted from Loki in the first place (#8259).This PR removes the dependency of Prometheus from the
pushpkg by copying some bits of the implementation for Prometheus'labels.Labels. We copy:Notes for reviewers:
pushpkg now depends ongolang.org/x/exp. I think it should be fine for projects importing thepushpkg to also depend ongolang.org/x/exp, right?