prometheus_client with labels is not working

[Rahul Sinha]

Code ::

from prometheus_client import start_http_server, Gauge

import random
from random import randrange

#Latency_Time = Gauge('consumer_gauge_seconds', 'Time spent in consuming message')
Latency_Time = Gauge('consumer_gauge_seconds', 'Time spent in consuming message', labelnames=['partition'])

@Latency_Time.track_inprogress()
def latency_request(latency):
     Latency_Time.labels('partition', '1').set(latency)
  # Latency_Time.set(latency)

if __name__ == '__main__':
start_http_server(17500)
while True:
latency_request(random.randrange(1900, 2150))

Error Message::

/Users/rahulsinha/anaconda3/envs/envpy37/bin/python /Users/rahulsinha/PycharmProjects/pythonProject/prom_pythonclient.py

Traceback (most recent call last):

  File "/Users/rahulsinha/PycharmProjects/pythonProject/prom_pythonclient.py", line 8, in <module>

    @Latency_Time.track_inprogress()

  File "/Users/rahulsinha/anaconda3/envs/envpy37/lib/python3.7/site-packages/prometheus_client/metrics.py", line 377, in track_inprogress

    self._raise_if_not_observable()

  File "/Users/rahulsinha/anaconda3/envs/envpy37/lib/python3.7/site-packages/prometheus_client/metrics.py", line 66, in _raise_if_not_observable

    raise ValueError('%s metric is missing label values' % str(self._type))

ValueError: gauge metric is missing label values

Process finished with exit code 1

[Rahul Sinha]

Code ::

from prometheus_client import start_http_server, Gauge

import random
from random import randrange

#Latency_Time = Gauge('consumer_gauge_seconds', 'Time spent in consuming message')    # This code works without label

Latency_Time = Gauge('consumer_gauge_seconds', 'Time spent in consuming message', labelnames=['partition'])

@Latency_Time.track_inprogress()
def latency_request(latency):

     Latency_Time.labels('partition', '1').set(latency). # I know there is something wrong here.. I'm not able to figure out what !
   # Latency_Time.set(latency)                           # This code works without label

if __name__ == '__main__':
     start_http_server(17500)
     while True:
          latency_request(random.randrange(1900, 2150))

[Chris Marchbanks]

Hello,

Which labelname a labelvalue is assigned to is based on the order of
the arguments, so you do not need to re-specify 'partition' when
setting the labels. Just Latency_Time.labels('1').set(latency) should
work for you.

Cheers,

Chris

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[Rahul Sinha]

Hi Chris,

Thank you for your reply. Kindly see comments highlighted in yellow. Please advice me the changes required inside the function.

Appreciate your help.

from prometheus_client import start_http_server, Gauge
import random
from random import randrange

#Latency_Time = Gauge('consumer_gauge_seconds', 'Time spent in consuming message') # This code works without label

Latency_Time = Gauge('consumer_gauge_seconds', 'Time spent in consuming message', labelnames=['partition'])

# Latency_Time.labels(1).set(2300) # Thanks. It works here.


@Latency_Time.track_inprogress()
def latency_request(partition, latency):
    Latency_Time.labels(partition).set(latency) # Same code doesn't works here. Kindly help

#   Latency_Time.labels('partition', '1').set(latency). # I know there is something wrong here.. I'm not able to figure out what !
# # Latency_Time.set(latency) # This code works without label

if __name__ == '__main__':
    start_http_server(17500)
    while True:

        latency_request(random.randrange(1, 12), random.randrange(1900, 2150))

Error ::

/Users/rahulsinha/anaconda3/envs/envpy37/bin/python /Users/rahulsinha/PycharmProjects/pythonProject/venv/prom_py1.py

Traceback (most recent call last):

  File "/Users/rahulsinha/PycharmProjects/pythonProject/venv/prom_py1.py", line 10, in <module>

    @Latency_Time.track_inprogress()

  File "/Users/rahulsinha/anaconda3/envs/envpy37/lib/python3.7/site-packages/prometheus_client/metrics.py", line 377, in track_inprogress

    self._raise_if_not_observable()

  File "/Users/rahulsinha/anaconda3/envs/envpy37/lib/python3.7/site-packages/prometheus_client/metrics.py", line 66, in _raise_if_not_observable

    raise ValueError('%s metric is missing label values' % str(self._type))

ValueError: gauge metric is missing label values

Thank You.

Regards,

Rahul Sinha