A method, product and system including obtaining metadata associated with at least one plugin of a runtime environment, wherein the runtime environment is configured to provide a service to a client, wherein the plugin is configured to measure or enforce metrics of the service; obtaining user selections regarding the metrics, wherein the user selections comprise constraints on the runtime environment; obtaining, based on the metadata of the plugin and based on the user selections, corresponding clauses textually describing the constraints; generating a contract, wherein the contract comprises the corresponding clauses; automatically generating a configuration file based on the user selections; and automatically enforcing the contract by: activating the runtime environment, loading the service in the runtime environment, configuring the plugin according to the configuration file, executing the plugin to identify a violation of the contract, and executing a client function of the client.