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Prevent re-definition of prometheus metrics #210

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Apr 25, 2020
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Prevent re-definition of prometheus metrics #210

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Prevent re-definition of prometheus metrics
Apr 25, 2020
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Apr 25, 2020
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36 changes: 21 additions & 15 deletions jupyter_server/prometheus/metrics.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5,23 +5,29 @@
conventions for metrics & labels.
"""

try:
# Jupyter Notebook also defines these metrics. Re-defining them results in a ValueError.
# Try to de-duplicate by using the ones in Notebook if available.
# See https://github.com/jupyter/jupyter_server/issues/209
from notebook.prometheus.metrics import HTTP_REQUEST_DURATION_SECONDS, TERMINAL_CURRENTLY_RUNNING_TOTAL, KERNEL_CURRENTLY_RUNNING_TOTAL

from prometheus_client import Histogram, Gauge
except ImportError:

from prometheus_client import Histogram, Gauge

HTTP_REQUEST_DURATION_SECONDS = Histogram(
'http_request_duration_seconds',
'duration in seconds for all HTTP requests',
['method', 'handler', 'status_code'],
)
HTTP_REQUEST_DURATION_SECONDS = Histogram(
'http_request_duration_seconds',
'duration in seconds for all HTTP requests',
['method', 'handler', 'status_code'],
)

TERMINAL_CURRENTLY_RUNNING_TOTAL = Gauge(
'terminal_currently_running_total',
'counter for how many terminals are running',
)
TERMINAL_CURRENTLY_RUNNING_TOTAL = Gauge(
'terminal_currently_running_total',
'counter for how many terminals are running',
)

KERNEL_CURRENTLY_RUNNING_TOTAL = Gauge(
'kernel_currently_running_total',
'counter for how many kernels are running labeled by type',
['type']
)
KERNEL_CURRENTLY_RUNNING_TOTAL = Gauge(
'kernel_currently_running_total',
'counter for how many kernels are running labeled by type',
['type']
)