Bryan Boreham 8dea1f04a5 Scrape tests: Better series references
`collectResultAppender` on its own will now use the labels hash
instead of a random number. This avoids the situation where a series
could be added twice under different references.

When there is an underlying appender, use the reference it generates.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
2025-09-02 14:51:19 +01:00
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