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venv/Lib/site-packages/notebook/prometheus/log_functions.py

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+from ..prometheus.metrics import HTTP_REQUEST_DURATION_SECONDS
+
+
+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='{}.{}'.format(handler.__class__.__module__, type(handler).__name__),
+        status_code=handler.get_status()
+    ).observe(handler.request.request_time())