pub struct TaskUpdate {
    pub new_tasks: Vec<Task>,
    pub stats_update: HashMap<u64, Stats>,
    pub dropped_events: u64,
}
Expand description

A task state update.

Each TaskUpdate contains any task data that has changed since the last update. This includes:

  • any new tasks that were spawned since the last update
  • the current stats for any task whose stats changed since the last update

Fields

new_tasks: Vec<Task>

A list of new tasks that were spawned since the last TaskUpdate was sent.

If this is empty, no new tasks were spawned.

stats_update: HashMap<u64, Stats>

Any task stats that have changed since the last update.

This is a map of task IDs (64-bit unsigned integers) to task stats. If a task’s ID is not included in this map, then its stats have not changed since the last TaskUpdate in which they were present. If a task’s ID is included in this map, the corresponding value represents a complete snapshot of that task’s stats at in the current time window.

dropped_events: u64

A count of how many task events (e.g. polls, spawns, etc) were not recorded because the application’s event buffer was at capacity.

If everything is working normally, this should be 0. If it is greater than 0, that may indicate that some data is missing from this update, and it may be necessary to increase the number of events buffered by the application to ensure that data loss is avoided.

If the application’s instrumentation ensures reliable delivery of events, this will always be 0.

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