In order to make the license that applies to each file as clear as possible, and to be consistent with elasticsearch, we are adding Apache 2.0 license headers to the top of each file.
Existence of this header is enforced by eslint and tslint and missing headers were automatically added in the last commit by running:
```
node scripts/eslint --fix && node scripts/tslint --fix
```
* [Stats] Add metrics collector and stats API
* uptime_ms in the process namespace
* make uptime_in_millis always equal process.uptime_ms
* fix api integration test
* fix api integration test better
* fix false positive with last change
* change object detection, add fallbacks to return undefined