tools. Each of the tools and APIs has been put into one of

the following tiers.

* Tier 1 - Must always be working (CI tests passing) for all

Current and LTS Node.js releases. A release will not be shipped if the test

suite for the tool/API is not green. To be considered for inclusion

in this tier it must have a good test suite and that test suite and a job

its dependencies; and

* The tool must be open source.

* Tier 2 - Must be working (CI tests passing) for all

LTS releases. An LTS release will not be shipped if the test

suite for the tool/API is not green. To be considered for inclusion

in this tier it must have a good test suite and that test suite and a job

| Debugger | Chrome Dev tools | ? | No | 3 |

| Debugger | Chakracore - time-travel | No | Data source only | too early |

| Tracing | trace\_events (API) | No | Yes | 1 |

| Tracing | trace\_gc | No | Yes | 1 |

| Tracing | DTrace | No | Partial | 3 |

| Tracing | LTTng | No | Removed? | N/A |

| Tracing | ETW | No | Partial | 3 |