Not possible to set Jaeger tracing address through Grafana config

[marefr]

What happened:
Received error when enabled Jaeger tracing using Grafana configuration:

EROR[06-12|13:08:08] error when flushing the buffer: write udp 127.0.0.1:54672->127.0.0.1:6831: write: connection refused logger=jaeger

What you expected to happen:
That Jaeger should use the address configured in Grafana and not log an error and by that function as expected.

How to reproduce it (as minimally and precisely as possible):
Changed Grafana configuration to enable Jaeger tracing:

[tracing.jaeger]
# jaeger destination (ex localhost:6831)
address = 172.21.0.4:6831

Anything else we need to know?:
If I set the environment variable export JAEGER_AGENT_HOST=172.21.0.4 before starting Grafana Jaeger works as expected. Seems like the problem is that environment variable override in Jaeger client library overrides agent host or port to the default if they're not provided through environment variables. There's a fix merged, but still no official version tagged including those changes, ref jaegertracing/jaeger-client-go#513.

Environment:

• Grafana version: master / 7.0.3