Inserting, fetching and pruning of metrics.

Inserting

Inserting is called by the internal WriteBuffer. It can be grouped depending on the buffer configuration inside the backend struct:

• flush_interval_ms: Time interval before the write buffer calls the backend
• max_buffer_size: Maximum count of events before the write buffer calls the backend

Fetching

Fetching is called when rendering metrics in the view. The filters argument is a struct with predefined fields: to, from, event_name and compare.

Pruning

Pruning is implemented to keep the datastore clean. Keeping data forever will increase the size of the storage and affect performance.

• pruner_threshold: Example: [months: -1]. Delete events older than a month.
• pruner_interval_ms: Example: 84_000. Time interval for the pruner process to run. The process simply calls #prune_events!/2.