testName: "openCensusAgent empty context",
			key:      "openCensusAgentContexts",
			option:   option.OpenCensusAgentContexts([]meshAPI.Tracing_OpenCensusAgent_TraceContext{}),
			expected: `["TRACE_CONTEXT","GRPC_TRACE_BIN","CLOUD_TRACE_CONTEXT","B3"]`,
		},
		{
			testName: "openCensusAgent order context",
			key:      "openCensusAgentContexts",
			option: option.OpenCensusAgentContexts([]meshAPI.Tracing_OpenCensusAgent_TraceContext{

}

func OpenCensusAgentAddress(value string) Instance {
	return newOptionOrSkipIfZero("openCensusAgent", value)
}

func OpenCensusAgentContexts(value []meshAPI.Tracing_OpenCensusAgent_TraceContext) Instance {
	return newOption("openCensusAgentContexts", value).
		withConvert(openCensusAgentContextConverter(value))
}

func StackDriverEnabled(value bool) Instance {
	return newOption("stackdriver", value)

        "ocagent_exporter_enabled": true,
        "ocagent_address": "{{ .openCensusAgent }}",
        "incoming_trace_context": {{ .openCensusAgentContexts }},
        "outgoing_trace_context": {{ .openCensusAgentContexts }},
        "trace_config": {
          "constant_sampler": {
            "decision": "ALWAYS_PARENT"
          },
          "max_number_of_annotations": 200,

		case *meshAPI.Tracing_OpenCensusAgent_:
			c := tracer.OpenCensusAgent.Context
			opts = append(opts, option.OpenCensusAgentAddress(tracer.OpenCensusAgent.Address),
				option.OpenCensusAgentContexts(c))
		}

		opts = append(opts, option.TracingTLS(config.Tracing.TlsSettings, metadata, isH2))
	}

	// Add options for Envoy metrics.