Supporting otel extension for Collector As a Service

[vnmehta7]

Hi team,

Collector as a Service provides an SAP internal infra to run our collectors centrally which can further have support to provide exporter to various systems like SAP Cloud Logging and OctoRoute.

The connection to CaaS collector requires MTLS.

During the integration of my CAP java application with CaaS, I found a common need to place secrets like client crt, server crt and client key in to some temporary folder in target CF container so that OTEL agent can refer to them and have MTLS to the Collector endpoint.

As of now to achieve this I created my own custom OTEL extension, which reads these secrets from VCAP and then adds these secrets under /tmp folder.

But I assume that Cloud logging service has already developed such OTEL extension ,here. So my request here to also have similar implementation for CaaS.

FYI @KarstenSchnitter @FWinklerOfficial @Bjoern

Regards,
Virral

[KarstenSchnitter]

Thanks for providing the issue. I agree, that introducing an exporter for CaaS in this extension would be sensible. It already contains exporters for SAP Cloud Logging and APM. I would be open to provide similar exporters. For this it would provide 6 new exporters:

• sap-caas-otlp (logs, metrics, traces over grpc)
• sap-caas-otlphttp (logs, metrics, traces over http/protobuf)

Note: Since CaaS is not a GA service, i use caas as a stand-in for an aligned name.

The exporters would detect service bindings and configure exporters accordingly. Detection will happen on the service label (configurable by system property, defaulting to caas-service). The found configuration will be used to configure the gRPC or HTTP exporters commonly used in the Java Agent.

Currently, there is no provided server certificate from the binding. Therefore, the server certificate needs to be downloaded during setup. Otherwise, the implementation would use the existing code of the extension.

[FWinkler79]

Note: Since CaaS is not a GA service, i use caas as a stand-in for an aligned name.

CaaS is GA. Just FYI.