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27 lines
1.0 KiB
Python
27 lines
1.0 KiB
Python
"""Log functions for prometheus"""
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from .metrics import HTTP_REQUEST_DURATION_SECONDS # type:ignore[unused-ignore]
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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=f"{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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