Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog and this project adheres to Semantic Versioning.

Unreleased

Breaking

Changed

changed: updated the sample output in example/default-metrics.js

Added

[14.1.1] - 2022-12-31

Changed

Increase compatibility with external build system such as rollup by making perf_hooks optional in gc.js

[14.1.0] - 2022-08-23

Changed

types: converted all the generic Metric types to be optional
The done() functions returned by gauge.startTimer() and summary.startTimer() now return the timed duration. Histograms already had this behavior.
types: fixed type for registry.getMetricsAsArray()
Improve performance of gague.inc() and gauge.dec() by calling hashObject() once.

Added

The processResources metric was added, which keeps a track of all sorts of active resources. It consists of the following gauges:
- nodejs_active_resources - Number of active resources that are currently keeping the event loop alive, grouped by async resource type.
- nodejs_active_resources_total - Total number of active resources. It is supposed to provide the combined result of the processHandles and processRequests metrics along with information about any other types of async resources that these metrics do not keep a track of (like timers).
Support gzipped pushgateway requests

[14.0.1] - 2021-11-02

Changed

changed: typedef for pushgateway to reflect js implementation.

[14.0.0] - 2021-09-18

Breaking

changed: linearBuckets does not propagate rounding errors anymore.

Fewer bucket bounds will be affected by rounding errors. Histogram bucket labels may change. 6f1f3b2

changed: The push gateway methods pushAdd(), push() and delete() now return Promises instead of accepting a callback:

// Old:
gateway.pushAdd({ jobName: 'test' }, (err, resp, body) => {});
// New:
gateway
  .pushAdd({ jobName: 'test' })
  .then(({ resp, body }) => {})
  .catch(err => {});
// or
const { resp, body } = await gateway.pushAdd({ jobName: 'test' });

f177b1f

changed: The default nodejs_eventloop_lag_* metrics are now reset every time they are observed. This prevents these metrics from "stabilizing" over a long period of time and becoming insensitive to small changes. For more info, see #370. 0f444cd

Changed

Add missing await/thens to examples. 074f339
Add missing type declaration for client.contentType. 3b66641
Modernize some label processing code. c9bf1d8

[13.2.0] - 2021-08-08

Changed

Don't add event listener to process if cluster module is not used.
fix: set labels for default memory metrics on linux.
fix: fix DEP0152 deprecation warning in Node.js v16+.
fix: Set aggregation mode for newer event loop metrics. (Fixes #418)
Improve performance of/reduce memory allocations in Gauge.

Added

feat: added zero() to Histogram for setting the metrics for a given label combination to zero
fix: allow Gauge.inc/dec(0) without defaulting to 1

[13.1.0] - 2021-01-24

Changed

fix: push client attempting to write Promise (fixes #390)
types: improve type checking of labels
fix: Summary#observe should throw when adding additional labels to labelset (fixes #262)

Added

feat: added the ability to pass labels as an object to labels() and remove()
Added: More examples with commented output

[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

[12.0.0] - 2020-02-20

Breaking

Dropped support for end-of-life Node.js versions 6.x and 8.x
Dropped the previously deprecated support for positional parameters in constructors, only the config object forms remain.
Default metrics are collected on scrape of metrics endpoint, not on an interval. The timeout option to collectDefaultMetrics(conf) is no longer supported or needed, and the function no longer returns a Timeout object.

Changed

chore: remove ignored package-lock.json
fix: process_max_fds is process limit, not OS (#314)
Changed Metric labelNames & labelValues in TypeScript declaration to a generic type T extends string, instead of string
Lazy-load Node.js Cluster module to fix Passenger support (#293)
fix: avoid mutation bug in registry.getMetricsAsJSON()
fix: improve performance of registry.getMetrics*
End function of histogram startTimer, when invoked returns the number of seconds
chore: reindent package.json
chore: correct var name in processStartTime
chore: add test for process_start_time_seconds
chore: spelling corrections in README

Added

feat: implement GC metrics collection without native(C++) modules.
feat: implement advanced event loop monitoring

[11.5.3] - 2019-06-27

Changed

Parameter compressCount in Summaries to control compression of data in t-digest.
Compress t-digest in Summaries

[11.5.2] - 2019-06-20

Changed

fix: avoid mutation bug in registry

[11.5.1] - 2019-06-13

Changed

fix: guard against missing constructor

[11.5.0] - 2019-06-04

Added

Added timestamps toggle to collectDefaultMetrics options
Export validateMetricName

[11.4.0] - 2019-06-04

Added

nodejs_active_handles metric to the collectDefaultMetrics(). Unlike nodejs_active_handles_total it split count of active handles by type.
nodejs_active_requests metric to the collectDefaultMetrics(). Unlike nodejs_active_requests_total it split count of active requests by type.

[11.3.0] - 2019-04-02

Changed

Check that cluster worker is still connected before attempting to query it for metrics. (#244)

Added

Added a remove() method on each metric type, based on Prometheus "Writing Client Libraries" section on labels

[11.2.1]

Breaking

Changed

Added

Updated types for Summary in typescript definition file

[11.2.0]

Changed

Updated child dependency merge patch version to remove vulnerability.

Added

Added an initial benchmark suite which can be run with npm run benchmarks.
Add support for sliding windows in Summaries

[11.1.3] - 2018-09-22

Changed

Fixed performance by avoiding Object.assign on hot paths, as well as mutating objects when appropriate.

[11.1.2] - 2018-09-19

Changed

Allow setting Gauge values to NaN, +Inf, and -Inf
Fixed histogram scrape performance by using acc.push instead of acc.concat. Fixes #216 with #219

[11.1.1] - 2018-06-29

Changed

Fixed processOpenFileDescriptors metric when no custom config was set

[11.1.0] - 2018-06-29

Added ability to set a name prefix in the default metrics

Changed

Fixed startTimer utility to not mutate objects passed as startLabels
Fixed Counter to validate labels parameter of inc() against initial labelset
Fixed AggregatorFactory losing the aggregator method of metrics

[11.0.0] - 2018-03-10

Breaking

Fixed gauge.setToCurrentTime() to use seconds instead of milliseconds
- This conforms to Prometheus best practices
Dropped support for node 4

[10.2.3] - 2018-02-28

Breaking

Changed

Fixed issue that registry.getMetricsAsJSON() ignores registry default labels

Added

10.2.2 - 2017-11-02

Changed

Fixed invalid process_virtual_memory_bytes reported under linux

10.2.1 - 2017-10-27

Changed

Only resolve/reject clusterMetrics promise if no callback is provided

10.2.0 - 2017-10-16

Changed

Don't add event listeners if cluster module is not used.
Fixed issue with counters having extra records when using empty labels

Added

Added reset to Counter and Gauge
Added resetMetrics to register to calling reset of all metric instances

10.1.1 - 2017-09-26

Changed

Update TypeScript definitions and JSDoc comments to match JavaScript sources
Fix lexical scope of arguments in cluster code

10.1.0 - 2017-09-04

Added

Support aggregating metrics across workers in a Node.js cluster.

10.0.4 - 2017-08-22

Changed

Include invalid values in the error messages

10.0.3 - 2017-08-07

Added

Added registerMetric to definitions file

Changed

Fixed typing of DefaultMetricsCollectorConfiguration in definitions file
Don't pass timestamps through to pushgateway by default

10.0.2 - 2017-07-07

Changed

Don't poll default metrics every single tick

10.0.1 - 2017-07-06

Added

Metrics should be initialized to 0 when there are no labels

10.0.0 - 2017-07-04

Breaking

Print deprecation warning when metrics are constructed using non-objects
Print deprecation warning when collectDefaultMetrics is called with a number

Added

Ability to set default labels by registry
Allow passing in registry as second argument to collectDefaultMetrics to use that instead of the default registry

Changed

Convert code base to ES2015 code (node 4)
- add engines field to package.json
- Use object shorthand
- Remove util-extend in favor of Object.assign
- Arrow functions over binding or putting this in a variable
- Use template strings
- prototype -> class

9.1.1 - 2017-06-17

Changed

Don't set timestamps for metrics that are never updated

9.1.0 - 2017-06-07

Added

Ability to merge registries

Changed

Correct typedefs for object constructor of metrics

9.0.0 - 2017-05-06

Added

Support for multiple registers
Support for object literals in metric constructors
Timestamp support

Changed

Collection of default metrics is now disabled by default. Start collection by running collectDefaultMetrics().

Deprecated

Creating metrics with one argument per parameter - use object literals instead.

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Changelog

Unreleased

Breaking

Changed

Added

[14.1.1] - 2022-12-31

Changed

[14.1.0] - 2022-08-23

Changed

Added

[14.0.1] - 2021-11-02

Changed

[14.0.0] - 2021-09-18

Breaking

Changed

[13.2.0] - 2021-08-08

Changed

Added

[13.1.0] - 2021-01-24

Changed

Added

[13.0.0] - 2020-12-16

Breaking

Changed

Added

[12.0.0] - 2020-02-20

Breaking

Changed

Added

[11.5.3] - 2019-06-27

Changed

[11.5.2] - 2019-06-20

Changed

[11.5.1] - 2019-06-13

Changed

[11.5.0] - 2019-06-04

Added

[11.4.0] - 2019-06-04

Added

[11.3.0] - 2019-04-02

Changed

Added

[11.2.1]

Breaking

Changed

Added

[11.2.0]

Changed

Added

[11.1.3] - 2018-09-22

Changed

[11.1.2] - 2018-09-19

Changed

[11.1.1] - 2018-06-29

Changed

[11.1.0] - 2018-06-29

Changed

[11.0.0] - 2018-03-10

Breaking

[10.2.3] - 2018-02-28

Breaking

Changed

Added

10.2.2 - 2017-11-02

Changed

10.2.1 - 2017-10-27

Changed

10.2.0 - 2017-10-16

Changed

Added

10.1.1 - 2017-09-26

Changed

10.1.0 - 2017-09-04

Added