Support arbitrary resource attributes

[bmerigan]

Is your feature request related to a problem? Please describe

Currently the traces that are logged via this module don't have environment metadata which means I cannot filter traces by environment in Elastic APM. e.g. development/test/staging/production

This feature and why it's useful is explained perfectly in this opentelemetry doco

Describe the solution you'd like

Just like we can set otel_service_name as per nginx-otel doco
I'd like to be able to set the environment with a directive called otel_service_environment

Bonus if you include service.node.name and service.version too.

Describe alternatives you've considered

Adding the value using a resource processor within the otel-collector, which works, but isn't right IMO.

[p-pautov]

I think, we can add generic otel_resource block, which would allow setting any resource level attributes, e.g.

otel_resource {
    "deployment.environment" "prod";
    "service.node.name" "mysvc";
    "service.version" "1.0";
}

[bmerigan]

Yeah that would work well

[sahilganguly]

@bmerigan could you include these attributes using the otel_span_attr directive? Assuming of course you can get those attributes as a variable in nginx.

[bmerigan]

@bmerigan could you include these attributes using the otel_span_attr directive? Assuming of course you can get those attributes as a variable in nginx.

I do use the otel_span_attr for some things, but these attributes are more at the top, trace level.