GetEnvOr gets an environment variable or returns ifNotFound value.

GracefulShutdown shuts down srv gracefully ane executes shutdown hooks.

InitJaeger inits and returns a Jaeger tracer and closer.

SetMiddlewares ..

SetRoutes sets /metrics and /health routes.

RequestDuration is a histogram metric to report request duration.

ShutdownHooks is a hooks slice that can be appended to execute code on shutdown.