How to use the elastic-apm-node.endTransaction function in elastic-apm-node

maxNbClients: maxNbClientsPerPlatform
            }
          })

          return disconnect(reason)
        }

        otherChannels = channels.filter(c => ![...organizationIds, ...userIds].includes(c))
        if (otherChannels.length) {
          channelsToJoin.push(...otherChannels.map(c => prefixChannel(c, { platformId, env })))
        }

        debug(`WebSocket ${socket.client.id} subscribing to ${channelsToJoin.join(' ')}`)
        socket.join(channelsToJoin)

        apm.endTransaction()
      }