Add Content-Type=text/plain for metrics endpoint #26
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Without the content type, prometheus will reject the metrics if no `fallback_scrape_protocol` is specified. https://prometheus.io/docs/prometheus/3.0/migration/#scrape-protocols https://prometheus.io/docs/instrumenting/exposition_formats/#text-based-format
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Without the content type, prometheus will reject the metrics if no
fallback_scrape_protocolis specified.https://prometheus.io/docs/prometheus/3.0/migration/#scrape-protocols https://prometheus.io/docs/instrumenting/exposition_formats/#text-based-format