Jaeger is always enabled

[roidelapluie]

common/tracing/tracing.go

Line 38 in 47e357f

if cfg.Sampler.SamplingServerURL == "" && cfg.Reporter.LocalAgentHostPort == "" && cfg.Reporter.CollectorEndpoint == "" {

Jaeger is always enabled because LocalAgentHostPort is by default ('localhost:6831').

Annoyingly the env variables used by jaeger are not publicly exposed by the jaeger package so a quick&clean fix is not that easy.

[roidelapluie]

https://github.com/jaegertracing/jaeger-client-go/blob/17fd3e8e517a4630dc276675cb2987782094a022/config/config_env.go#L201-L207