1. A method for configuring message tracking in a telecom service, comprising: initiating, by a service module, a registration message to a tracking server, and synchronizing a tracking condition with the tracking server; initiating, by a monitoring client, a registration message to the tracking server, and receiving the tracking condition synchronously sent by the tracking server; and configuring, by the monitoring client, a key value for a key identification field of the tracking condition, and sending the key value to the corresponding service module through the tracking server in a synchronization message of configuration information to complete a message tracking configuration, then receiving a configuration success message returned from the service module; determining, by the service module, whether the key value of the key field in the message received and sent in its own service logic is equal to the configured value and upon a determination of equality, sending the message to the tracking server; wherein the registration message initiated by the service module to the tracking server comprises: identity information and address information of the service module, and a name and/or type of a service performed by the service module; wherein besides the key value configured for the key identification field, the synchronization message of configuration information further includes the identity information and/or address information of the monitoring client which sends the synchronization message of configuration information; wherein the tracking condition is a trackable message in the service performed by the service module; wherein the trackable message comprises: a key identification field name of a trackable message in a service executed by the service module and an Extensible Markup Language (XML) format description document of a message structure of the trackable message.