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Changelog

Unreleased

0.5.0

  • New improved implementation of _generate_samples for MultiProcessRedisBackend:

    • Improved performance for generating metrics
    • Fixed a bug where on multiprocess on some scrapes a metric wouldn't be picked up due to missing local collector child
    • Now on labeled metrics, the labels/value combination will be initialized to 0 if it doesn't exists (before only the key would be initialized)

  • Redis keys expire time can now be configured via the expire_key_time config passed when loading the backend

  • Experimental prometheus_client patching in-place to quickly test the library on existing codebases

  • DEPRECATED: key_prefix for redis configuration. Prefer a side-car container or a separate redis/redis db per service.

0.4.0

  • python 3.12 support

0.3.0

  • fix generate_metrics to handle custom collectors

0.2.0

  • kwargs (keyword arguments) support for the labels() method. 
    metric = Counter("counter", "desc", required_labels=["method"])

# dict approach
metric.labels({"method": "POST"})

# kwargs approach
metric.labels(method="POST")

0.1.0

  • asgi middleware for FastAPI support

0.0.16

  • add Summary metric type

0.0.15

  • add support for python 3.8 & 3.9

0.0.14

  • decorator support for async functions

0.0.13

  • Support for _generate_samples in Backend
  • MultiProcessRedisBackend:
    • Improved scraping performance via pipelining

0.0.12

  • Escape help & label_values during exposition
  • MultiProcessRedisBackend:
    • Add key_prefix config to specify stored key name prefix.

0.0.11

  • MultiProcessRedisBackend:
    • handle get with unexpected key deletion

0.0.10

  • MultiProcessRedisBackend:
    • initialize key on redis on instantiation
    • update expiry when retrieving a key

0.0.9

  • The inf histogram bucket label will now be exported as +Inf in line with the other clients

0.0.8

  • Histogram now passes custom buckets to child instances

0.0.7

  • fix MetricType string representation for python 3.11

0.0.6

First release ready to be tested 🎉

Redis multiprocess backend support still experimental.