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1"""Log functions for prometheus"""
3from .metrics import HTTP_REQUEST_DURATION_SECONDS # type:ignore[unused-ignore]
6def prometheus_log_method(handler):
7 """
8 Tornado log handler for recording RED metrics.
10 We record the following metrics:
11 Rate - the number of requests, per second, your services are serving.
12 Errors - the number of failed requests per second.
13 Duration - The amount of time each request takes expressed as a time interval.
15 We use a fully qualified name of the handler as a label,
16 rather than every url path to reduce cardinality.
18 This function should be either the value of or called from a function
19 that is the 'log_function' tornado setting. This makes it get called
20 at the end of every request, allowing us to record the metrics we need.
21 """
22 HTTP_REQUEST_DURATION_SECONDS.labels(
23 method=handler.request.method,
24 handler=f"{handler.__class__.__module__}.{type(handler).__name__}",
25 status_code=handler.get_status(),
26 ).observe(handler.request.request_time())