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