OpenTelemetry Integration

[phillipgibson]

Please describe the Improvement and/or Feature Request
Have OSM emit telemetry metrics by utilizing the OpenTelemetry API and SDK. We are aware of Envoy not being supported at this time envoyproxy/envoy#9958.

Scope (please mark with X where applicable)

• New Functionality [X]
• Install [ ]
• SMI Traffic Access Policy [ ]
• SMI Traffic Specs Policy [ ]
• SMI Traffic Split Policy [ ]
• Permissive Traffic Policy [ ]
• Ingress [ ]
• Egress [ ]
• Envoy Control Plane [ ]
• CLI Tool [ ]
• Metrics [X]
• Certificate Management [ ]
• Sidecar Injection [ ]
• Logging [ ]
• Debugging [ ]
• Tests [ ]
• CI System [ ]
• Project Release [ ]

Possible use cases
Having OSM/SMI metrics/telemetry being emitted by the OpenTelemetry specification.

[phillipgibson]

We're excited about the OpenTelemetry project and the issues it looks to resolve around standardizing telemetry data. After an assessment to see if it is beneficial for OMS to implement OpenTelemerty, our finding see the project has not matured to a level that would make sense for integration at this point. The lack of Envoy proxy support was a strong factor, since without it we would only be able to emit control plan metrics.

We will revisit this assessment in the near future as more progress is made to OpenTelemetry.