Calling the Remote Engine monitoring API

Procedure

Using a REST client, for example, Talend Cloud API Tester, call the following endpoint:
```
GET http://{ip_where_RE_is_installed}:8043/metrics/json
GET http://{ip_where_RE_is_installed}:8043/metrics/prometheus
```
8043 is the default HTTP port of the Remote Engine. Replace it with the port used during installation.
Example
```
GET http://localhost:8043/metrics/json
```
Add a header:
Authorization: Bearer {token}
The token is defined in the <RemoteEngineInstallationDirectory>/etc/org.talend.observability.http.security.cfg file as endpointToken={token}.

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