docs: improve HA tracker setup and verification guide - #7780
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## Summary Clarifies Prometheus HA pair labeling (no env expansion in external_labels), recommends write_relabel for `__replica__`, documents Alertmanager duplicate notifications, and adds verification metrics/status page guidance. Cross-links arguments and the HA pair guide. Fixes cortexproject#3011 Signed-off-by: Vedant Madane <6527493+VedantMadane@users.noreply.github.com>
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Summary
Clarifies Prometheus HA pair labeling (no env expansion in external_labels), recommends write_relabel for
__replica__, documents Alertmanager duplicate notifications, and adds verification metrics/status page guidance.Fixes #3011