Add variable labels to Upstream Servers and Server Zones metrics #114
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Proposed changes
Add optional support to add variable labels to Upstream Server and Server Zone metrics when using the prom exporter as a library.
This change does not affect when the exporter is run as a binary, it's basically a change needed by the Ingress Controller when using this code, to make sure we can create relations between Ingress Controller resources and NGINX configuration to add labels to the metrics.