NewUpdater creates an instance of Updater and other services it requires.

prepareHealthStatus prepares health status payload.

Completed represents the state value completed for agent update.

Initialized represents the state value initialized for agent update.

Installed represents the state value installed for agent update.

NotStarted represents the state value not started for agent update.

Rollback represents the state value rollback for agent update.

RolledBack represents the state value rolledBack for agent update.

Staged represents the state value staged for agent update.

TestExecution represents state value denoting test execution on customer's instance.

UpdaterMetric represents state value to report intermediate update metric.

UpdateDetail Book keeping detail for Agent Update.

Updater contains logic for performing agent update.

ContextMgr reprents context management logics.

Service is an interface represents for SendReply, UpdateInstanceInfo.

T represents the interface for agent update.

UpdateState represents the state of update process.