Histogram are breaking prometheus

[L3o-pold]

const histogram = Histogram.with({
    name: 'http_requests_duration',
    help: 'A histogram of the requests duration.',
    buckets: [ .05, .1, .2, .5, 1, 3 ],
});

histogram.observe(.42);
histogram.observe(.58);

Registry.default.metrics()

Will render

# HELP http_requests_duration A histogram of the requests duration.
# TYPE http_requests_duration histogram
http_requests_duration_bucket,le="0.05"} 0
http_requests_duration_bucket,le="0.1"} 0
http_requests_duration_bucket,le="0.2"} 0
http_requests_duration_bucket,le="0.5"} 0
http_requests_duration_bucket,le="1"} 4
http_requests_duration_bucket,le="3"} 4
http_requests_duration_bucket,le="+Inf"} 5
http_requests_duration_sum 8
http_requests_duration_count 5

It breaks prometheus as a { is missing in keys.

I think the issue is located here https://github.com/marcopacini/ts-prometheus/blob/master/histogram.ts#L56 or in the example.

[marcopacini]

@L3o-pold Thank you for reporting me this issue.