raffis / renovate-metrics / 24661496062

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fix: prevent panic because of duplicate metrics (#148)

When the same dependency is referenced twice in the same file, and renovate is configured to create separate PRs for the two references,
renovate-metrics will have two packageUpdate structs which are different, but emit the same metric.

This will lead to a panic:
> panic: [from Gatherer #1] collected metric "renovate_dependency_update" { … } was collected before with the same name and label values

With this change the branch name is copied to a local variable for later usage and set to an empty string for the comparison happening on
map access. Thus the existing metric will be found and increased.

Signed-off-by: Pascal Hofmann <mail@pascalhofmann.de>

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