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37 lines
1.4 KiB
37 lines
1.4 KiB
"""
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Prometheus metrics exported by Jupyter Notebook Server
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Read https://prometheus.io/docs/practices/naming/ for naming
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conventions for metrics & labels.
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"""
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from prometheus_client import Histogram
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# This is a fairly standard name for HTTP duration latency reporting
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HTTP_REQUEST_DURATION_SECONDS = Histogram(
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'http_request_duration_seconds',
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'duration in seconds for all HTTP requests',
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['method', 'handler', 'status_code'],
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)
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def prometheus_log_method(handler):
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"""
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Tornado log handler for recording RED metrics.
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We record the following metrics:
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Rate - the number of requests, per second, your services are serving.
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Errors - the number of failed requests per second.
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Duration - The amount of time each request takes expressed as a time interval.
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We use a fully qualified name of the handler as a label,
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rather than every url path to reduce cardinality.
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This function should be either the value of or called from a function
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that is the 'log_function' tornado setting. This makes it get called
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at the end of every request, allowing us to record the metrics we need.
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"""
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HTTP_REQUEST_DURATION_SECONDS.labels(
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method=handler.request.method,
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handler='{}.{}'.format(handler.__class__.__module__, type(handler).__name__),
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status_code=handler.get_status()
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).observe(handler.request.request_time())
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