Hello everyone,
The following is an example of a pattern we use frequently:
import time
from prometheus_client import start_http_server
from prometheus_client.core import GaugeMetricFamily, REGISTRY
def costly_function():
"E.g., queries someone else's API and uses up API credits, etc..."
return ('dev', 'uat', 'prod')
class Collector:
def collect(self):
gauge = GaugeMetricFamily('example_gauge',
'Example gauge', labels=["environment"])
for environment in costly_function():
print("adding sample for environment=%s" % environment)
gauge.add_metric([environment], 1)
yield gauge
REGISTRY.register(Collector())
start_http_server(8080)
print("server listening on port 8080")
while True:
time.sleep(60)
When we hook these kinds of exporter up in Google's GKE, and expose them
via ILB Services, the ILB health checks query them for health via a
/healthz endpoint.
That triggers an unwanted call to the costly_function() which we'd like to
avoid.
Is there a simple way to intercept the call to /healthz and return e.g., an
"OK" response but without resorting to a framework like Flask or Twisted?
We're at pains to keep these exporters as simple as possible.
Thanks in advance!
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