Instana

- [AWS Fargate]: Make optional dependencies on native add-ons truely optional (do not break the Docker build on `RUN /instana/setup.sh`).
- Fix: Propagate `X-INSTANA-L: 0` downstream with AMQP headers.

- Fix bogus warning about invalid configuration emitted during startup (`"Invalid configuration: config.tracing.http.extraHttpHeadersToCapture is not an array, the value will be ignored: {}"`).
- [Google Cloud Run]: *Experimental* in-process data collection for Google Cloud Run services via the new package `instana/google-cloud-run`. Requires at least Instana back end version 185. `instana/google-cloud-run` supports Node.js 8.6.0 or later. Note that this is an early technical preview and not ready for general usage. At this time, no support can be provided for this new package. This will change once Google Cloud Run support becomes generally available with Instana.

- Fix(HTTP1/Server): Also set Server-Timing header when X-INSTANA-T is incoming (that is, not only when we start a fresh trace).
- Fix(HTTP1/Server): Do not append another intid key-value pair to Server-Timing if it is already present.
- Fix(HTTP2/Server): Add support for website monitoring back end correlation via Server-Timing header.
- Fix(HTTP2/Server): Add support for X-Instana-Service.
- Fix(HTTP2/Server): Inject the trace ID into the request to enable application code to inject it into the response body.
- Fix(HTTP2/Server): Use case-insensitive header matching as incoming headers are already normalized to lower case (performance improvement).
- Add support for `INSTANA_EXTRA_HTTP_HEADERS` variable.
- Fix(HTTP1/HTTP2): Fix handling for headers of type array (normalize to string, separated by 0x2C 0x20).
- [AWS Fargate] Add support for `INSTANA_ZONE`.
- [AWS Fargate] Add support for `INSTANA_TAGS`.
- Secrets Filtering: Replace values for filtered query parameters with `<redacted>` instead of removing the whole key-value pair.
- [AWS Fargate] Add support for `INSTANA_SECRETS`.
- [AWS Fargate] Add support for `INSTANA_EXTRA_HTTP_HEADERS`.
- [AWS Lambda] Add support for `INSTANA_SECRETS`.
- [AWS Lambda] Make `INSTANA_EXTRA_HTTP_HEADERS` also apply to HTTP exits.
- [AWS Lambda] Improve handling for `event.multiValueHeaders`.

- Fall back to `process.mainModule.filename` as the Node.js app's name when the `package.json` file is not present.
- Capture dependencies of an app even if the `package.json` file is not present, by inspecting the `node_modules` folder that is closest to `process.mainModule` in the file system.

- Add instrumentation for the [Google Cloud Storage client](https://googleapis.dev/nodejs/storage/latest/index.html).

- Drop support for Node.js versions 4 (which was EOL 2018-04-30) and 5 (EOL 2016-06-30) in `instana/collector`. If you want to use `instana/collector` with Node.js version 4 or 5 please pin `instana/collector` to version `1.103.0`.
- Fix: Capture MongoDB aggregate operations correctly.
- Fix: Keep async context across Mongoose custom thenables.