Sourced from prom-client's releases.

13.0.0

[13.0.0] - 2020-12-16

Breaking

• changed: The following functions are now async (return a promise): registry.metrics() registry.getMetricsAsJSON() registry.getMetricsAsArray() registry.getSingleMetricAsString()

  If your metrics server has a line like res.send(register.metrics()), you should change it to res.send(await register.metrics()).

  Additionally, all metric types now accept an optional collect function, which is called when the metric's value should be collected and within which you should set the metric's value. You should provide a collect function for point-in-time metrics (e.g. current memory usage, as opposed to HTTP request durations that are continuously logged in a histogram).

• changed: register.clusterMetrics() no longer accepts a callback; it only returns a promise.

• removed: v12.0.0 added the undocumented functions registry.registerCollector and registry.collectors(). These have been removed. If you were using them, you should instead provide a collect function as described above.

Changed

• fix: provide nodejs_version_info metric value after calling registry.resetMetrics() (#238)
• fix: provide process_max_fds metric value after calling registry.resetMetrics()
• fix: provide process_start_time_seconds metric value after calling registry.resetMetrics()
• chore: improve performance of registry.getMetricAsPrometheusString
• chore: refactor metrics to reduce code duplication
• chore: replace utils.getPropertiesFromObj with Object.values
• chore: remove unused catch bindings
• chore: upgrade Prettier to 2.x
• fix: startTimer returns number in typescript instead of void
• fix: incorrect typings of `registry.getSingleMetric' (#388)
• chore: stop testing node v13 on CI

Added

• feat: exposed registry.registerCollector() and registry.collectors() methods in TypeScript declaration
• Added: complete working example of a pushgateway push in example/pushgateway.js
• feat: added support for adding labels to default metrics (#374)
• Added CHANGELOG reminder

Sourced from prom-client's changelog.

[13.0.0] - 2020-12-16

Breaking

• changed: The following functions are now async (return a promise): registry.metrics() registry.getMetricsAsJSON() registry.getMetricsAsArray() registry.getSingleMetricAsString()

  If your metrics server has a line like res.send(register.metrics()), you should change it to res.send(await register.metrics()).

  Additionally, all metric types now accept an optional collect function, which is called when the metric's value should be collected and within which you should set the metric's value. You should provide a collect function for point-in-time metrics (e.g. current memory usage, as opposed to HTTP request durations that are continuously logged in a histogram).

• changed: register.clusterMetrics() no longer accepts a callback; it only returns a promise.

• removed: v12.0.0 added the undocumented functions registry.registerCollector and registry.collectors(). These have been removed. If you were using them, you should instead provide a collect function as described above.

Changed

• fix: provide nodejs_version_info metric value after calling registry.resetMetrics() (#238)
• fix: provide process_max_fds metric value after calling registry.resetMetrics()
• fix: provide process_start_time_seconds metric value after calling registry.resetMetrics()
• chore: improve performance of registry.getMetricAsPrometheusString
• chore: refactor metrics to reduce code duplication
• chore: replace utils.getPropertiesFromObj with Object.values
• chore: remove unused catch bindings
• chore: upgrade Prettier to 2.x
• fix: startTimer returns number in typescript instead of void
• fix: incorrect typings of `registry.getSingleMetric' (#388)
• chore: stop testing node v13 on CI

Added

• feat: exposed registry.registerCollector() and registry.collectors() methods in TypeScript declaration
• Added: complete working example of a pushgateway push in example/pushgateway.js
• feat: added support for adding labels to default metrics (#374)
• Added CHANGELOG reminder

• 2c9ae0e 13.0.0
• fecd75e feat: added support for adding labels to default metrics (#374)
• 8d69d1f chore: remove appveyor CI (#395)
• 815a51a Removed appveyor badge
• 68ec87a chore: remove travis badge from readme (#360)
• 48ed6c8 a complete working example of a pushgateway push (#377)
• 74f182e chore: remove travis CI config (#394)
• bed0e1d chore: update eslint and typescript to latest (#393)
• 5649396 bug: fix regression in 4e6aacd (#384)
• 25f9c40 fix(types): Registry.getSingleMetric may return undefined (#388)
• Additional commits viewable in compare view

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