Demo example

[glazychev-art]

Describe the bug
No data from metrics-load-generator

Steps to reproduce
docker-compose up -d from examples/demo

What did you expect to see?
New metrics (request_latency, request_counts...) at http://0.0.0.0:9090 (Prometheus).

What did you see instead?
If we look at logs, we can see that there are problems:

$ docker logs demo_metrics-load-generator_1
#0: LineLength: 97By
#1: LineLength: 3By
#2: LineLength: 800By
#3: LineLength: 86By
Latency: 6204.225ms
2020/12/18 12:30:22 rpc error: code = Unimplemented desc = unknown service opentelemetry.proto.collector.metrics.v1.MetricsService
#0: LineLength: 972By
#1: LineLength: 267By
#2: LineLength: 18By
#3: LineLength: 749By
Latency: 2377.241ms
#0: LineLength: 576By
#1: LineLength: 382By
#2: LineLength: 645By
#3: LineLength: 570By
#4: LineLength: 927By
#5: LineLength: 96By
Latency: 84.228ms
#0: LineLength: 836By
#1: LineLength: 975By
#2: LineLength: 591By
#3: LineLength: 305By
#4: LineLength: 958By
#5: LineLength: 249By
Latency: 26.179ms
Latency: 36.312ms
#0: LineLength: 185By
#1: LineLength: 70By
#2: LineLength: 497By
Latency: 427.285ms
2020/12/18 12:30:25 rpc error: code = Unimplemented desc = unknown service opentelemetry.proto.collector.trace.v1.TraceService
#0: LineLength: 363By
#1: LineLength: 528By
#2: LineLength: 703By
#3: LineLength: 398By
#4: LineLength: 200By
Latency: 1117.132ms
2020/12/18 12:30:29 rpc error: code = Unimplemented desc = unknown service opentelemetry.proto.collector.metrics.v1.MetricsService
2020/12/18 12:30:30 rpc error: code = Unimplemented desc = unknown service opentelemetry.proto.collector.trace.v1.TraceService
#0: LineLength: 873By
Latency: 4823.216ms
2020/12/18 12:30:36 exporter disconnected

What version did you use?
Version: default (from test)

What config did you use?
golang 1.15 for metrics-load-generator (there is problem with 1.12.7):

  metrics-load-generator:
    image: golang:1.15
...

Environment
OS: (e.g., "Ubuntu 20.04")

Additional context
Could you please explain me how to run demo example? Thank you!

[glazychev-art]

It was needed to update the config file otel-agent-config.yaml.
Need to add otlp to receivers section.