Major There are some issues with setting the OPENTRACING_HEADER_FORWARD value.
1. The docs say the env var is called OPENTRACING_HEADER_FORWARD: https://github.com/3scale/apicast/blob/01c5d36/doc/parameters.md#opentracing_header_forward
However, when setting this env var, it doesn't change anything. When starting the container with OPENTRACING_TRACER=jaeger, the header uber-trace-id is added.
2. Despite what docs say, the actual value that seems to be used in the code is OPENTRACING_FORWARD_HEADER https://github.com/3scale/apicast/blob/ad56f56/gateway/src/apicast/cli/environment.lua#L116
When trying to set this env var, by adding -e OPENTRACING_TRACER=jaeger -e OPENTRACING_FORWARD_HEADER=my-tracing-header to the docker run command, the following error is thrown by APIcast:
2018/12/07 08:38:21 [debug] 17#17: *2 [lua] env.lua:86: fetch(): env: OPENTRACING_FORWARD_HEADER = my-tracing-header ERROR: /usr/local/share/lua/5.1/liquid.lua:1887: Liquid runtime error, stoped at line_num: 46 cols:102. INFO: filter invoke fails stack traceback: /usr/local/share/lua/5.1/liquid.lua:1887: in function 'raise_error' /usr/local/share/lua/5.1/liquid.lua:2384: in function 'visit' /usr/local/share/lua/5.1/liquid.lua:1999: in function 'visit' /usr/local/share/lua/5.1/liquid.lua:1975: in function 'visit' /usr/local/share/lua/5.1/liquid.lua:2458: in function 'visit' /usr/local/share/lua/5.1/liquid.lua:1975: in function 'visit' /usr/local/share/lua/5.1/liquid.lua:1975: in function 'interpret' /usr/local/share/lua/5.1/liquid.lua:2410: in function 'visit' /usr/local/share/lua/5.1/liquid.lua:1975: in function 'render' /opt/app-root/src/src/apicast/cli/command/start.lua:56: in function 'nginx_config' /opt/app-root/src/src/apicast/cli/command/start.lua:157: in function 'start' /opt/app-root/src/src/apicast/cli.lua:49: in function </opt/app-root/src/src/apicast/cli.lua:29> /tmp/4nKyUHFgIG:60: in function 'file_gen' init_worker_by_lua:51: in function <init_worker_by_lua:49> [C]: in function 'xpcall' init_worker_by_lua:58: in function <init_worker_by_lua:56> loading staging environment configuration: /opt/app-root/src/config/staging.lua
