code: function onActFinished(context, next) {
    const msg = context.response.payload
  
    // pass to act context
    if (msg) {
      context.request$ = msg.request || {}
      context.trace$ = msg.trace || {}
      context.meta$ = msg.meta || {}
    }
  
    // calculate request duration
    const now = Util.nowHrTime()
    const diff = now - context.trace$.timestamp
    context.trace$.duration = diff
  
    if (context._config.traceLog) {
      context.log = context.log.child({
        tag: context._config.tag,
        requestId: context.request$.id,
        parentSpanId: context.trace$.parentSpanId,
        traceId: context.trace$.traceId,
        spanId: context.trace$.spanId
      })
      context.log.info(
        {
          pattern: context.trace$.method,
          responseTime: context.trace$.duration
        },
        'Request completed'
      )
    } else {
      context.log.info(
        {
          requestId: context.request$.id,
          pattern: context.trace$.method,
          responseTime: context.trace$.duration
        },
        'Request completed'
      )
    }
  
    next()
  }
docs: - Restore context
  - Measure request duration
  
  @param {*} context
  @param {*} next