# prometheus-gc-stats
> Report Garbage Collection stats using Prometheus

[![NPM Version][npm-image]][npm-url]
[![Build Status][travis-image]][travis-url]

[![Dependency Status][david-image]][david-url]
[![Optional Dependency Status][david-optional-image]][david-optional-url]
[![Peer Dependency Status][david-peer-image]][david-peer-url]
[![Dev Dependency Status][david-dev-image]][david-dev-url]

## Usage

This module has a peer dependency on [`prom-client`](https://github.com/siimon/prom-client). Currently, version 3-5 are supported.

This module follows the same API as the core default metrics. To start collection GC stats, invoke the exported function to create the
metrics, then invoke the returned function to start the collecting.

### `gc-stats`

The module doing the GC stats collecting is [`gc-stats`](https://github.com/dainis/node-gcstats). This module requires native dependencies.
If the stats don't show up, make sure to check `npm`'s install log for failures.

## Metrics exposed

This module exposes 3 metrics:

1. `nodejs_gc_runs_total`: Counts the number of time GC is invoked
2. `nodejs_gc_pause_seconds_total`: Time spent in GC in seconds
3. `nodejs_gc_reclaimed_bytes_total`: The number of bytes GC has freed

## Credits

Thanks to @tcolgate for the original implementation.


[travis-url]: https://travis-ci.org/SimenB/node-prometheus-gc-stats
[travis-image]: https://img.shields.io/travis/SimenB/node-prometheus-gc-stats.svg
[npm-url]: https://npmjs.org/package/prometheus-gc-stats
[npm-image]: https://img.shields.io/npm/v/prometheus-gc-stats.svg
[david-url]: https://david-dm.org/SimenB/node-prometheus-gc-stats
[david-image]: https://img.shields.io/david/SimenB/node-prometheus-gc-stats.svg
[david-dev-url]: https://david-dm.org/SimenB/node-prometheus-gc-stats#info=devDependencies
[david-dev-image]: https://img.shields.io/david/dev/SimenB/node-prometheus-gc-stats.svg
[david-peer-url]: https://david-dm.org/SimenB/node-prometheus-gc-stats#info=peerDependencies
[david-peer-image]: https://img.shields.io/david/peer/SimenB/node-prometheus-gc-stats.svg
[david-optional-url]: https://david-dm.org/SimenB/node-prometheus-gc-stats#info=optionalDependencies
[david-optional-image]: https://img.shields.io/david/optional/SimenB/node-prometheus-gc-stats.svg


Report Garbage Collection stats using Prometheus. 

Report Garbage Collection stats using Prometheus

simenb

prometheus-gc-stats

(Experimental) An ambiguous license classifier was found.

What is an ambiguous license classifier?

Ambiguous License Classifier

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Package version is not a valid semantic version (semver).

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Bad semver

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Bad dependency semver

Source files contain bidirectional unicode control characters. This could indicate a Trojan source supply chain attack. See: trojansource.codes for more information.

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Bidirectional unicode control characters

This package has multiple bin scripts with the same name.  This can cause non-deterministic behavior when installing or could be a sign of a supply chain attack

What is bin script confusion?

Bin script confusion

Semantic versions published out of chronological order.

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Chronological version anomaly

Project maintainer's SSH key has been compromised.

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Compromised SSH key

(Experimental) Copyleft license information was found

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Copyleft License

Contains a Critical Common Vulnerability and Exposure (CVE).

What is a critical CVE?

Title

Critical CVE

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High CVE

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What is debug access?

Debug access

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Deprecated

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Deprecated license

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Possible typosquat attack

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Dynamic require

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Empty package

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Environment variable access

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What are extraneous dependencies?

Name

Extraneous dependency

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What are file dependencies?

File dependency

Accesses the file system, and could potentially read sensitive data.

What is filesystem access?

Filesystem access

Package has a dependency with a floating version range.  This can cause issues if the dependency publishes a new major version.

What are floating dependencies?

Floating dependency

Contains a dependency which resolves to a remote git URL. Dependencies fetched from git URLs are not immutable can be used to inject untrusted code or reduce the likelihood of a reproducible install.

What are git dependencies?

Git dependency

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GitHub dependency

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AI has identified this package as malware. This is a strong signal that the package may be malicious.

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AI detected potential malware

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AI detected security risk

Contains native code which could be a vector to obscure malicious code, and generally decrease the likelihood of reproducible or reliable installs.

What's wrong with native code?

Native code

Contains high entropy strings. This could be a sign of encrypted data, leaked secrets or obfuscated code.

What are high entropy strings?

High entropy strings

Contains unicode homoglyphs which can be used in supply chain confusion attacks.

What are unicode homoglyphs?

Unicode homoglyphs

Contains a dependency which resolves to a remote HTTP URL which could be used to inject untrusted code and reduce overall package reliability.

What are http dependencies?

HTTP dependency

Install scripts are run when the package is installed. The majority of malware in npm is hidden in install scripts.

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Install scripts

Package has an invalid manifest file and can cause installation problems if you try to use it.

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Invalid manifest file

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What are invisible characters?

Invisible chars

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License exception

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Long strings

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Major refactor

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Known malware

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Manifest confusion

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What is a medium CVE?

Medium CVE

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Low CVE

This package contains minified code.  This may be harmless in some cases where minified code is included in packaged libraries, however packages on npm should not minify code.

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Minified code

(Experimental) A package's licensing information has fine-grained problems

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The package was published by an npm account that no longer exists.

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(Experimental) Package contains multiple licenses.

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Modified license exception

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What is a modified license?

Modified license

What is network access?

Network access

A new npm collaborator published a version of the package for the first time. New collaborators are usually benign additions to a project, but do indicate a change to the security surface area of a package.

What is new author?

New author

Package does not specify a list of contributors or an author in package.json.

Why is contributor and author data important?

No contributors or author data

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No bug tracker

(Experimental) License information could not be found

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Why are missing repositories important?

No repository

Package does not have any tests. This is a strong signal of a poorly maintained or low quality package.

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No tests

Package is not semver >=1. This means it is not stable and does not support ^ ranges.

What is wrong with semver < v1?

No v1

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No website

(Experimental) Package has a non-FSF-approved license.

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Non OSI license

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prometheus-gc-stats