fix(prometheus): use correct content-type header
#839
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Would you mind add some test case? |
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added 👍 |
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hah, didn't notice the formatting thing. fix pushed |
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Thanks！ |
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The header should include the version.
https://prometheus.io/docs/instrumenting/exposition_formats/#text-based-format
https://docs.rs/prometheus/0.13.4/src/prometheus/encoder/text.rs.html#12-13