inconsistent number of recorded readings for the asset (GET /fledge/asset or the asset tab in the UI)

[kwitekrac]

Description:
I'm experiencing inconsistent number of recorded readings for the asset when running Fledge (Fledge power version) with a custom South Python-based plugin. Fledge is configured with the following storage setup:

Fledge Power version: 2.4.0 and 2.4.0-141(nightly build)
Storage plugin: PostgreSQL
Readings plugin: SQLMemory
South plugin: Python based RabbitMQ client

During testing, I stream approximately 900 datapoints per second to the plugin in one batch, calling:

async_ingest.ingest_callback(c_callback, c_ingest_ref, ingest_elements)

where ingest_elements contains around 900 elements.

Actual Behavior:
After running the test, I checked the following metrics:

GET /fledge/south requests (South tab in GUI):
The number of updates indicated is 599:

[{"count": 599, "asset": "0292f5b3-7a02-3378-e723-9aef0d8c8831-21-A_mag"}, {"count": 599, "asset": "0292f5b3-7a02-3378-e723-9aef0d8c8831-21-B_mag"} ...]

Note: The message returns the counter per asset, but not for the entire service. The value displayed by the UI is unclear.

GET /fledge/statistics:
The same results are shown, with 599 updates received for each asset.

GET /fledge/asset (Asset tab in GUI):
Indicates 119 to 120 updates per asset. Observing this parameter during the test, I noticed that around 450 updates, it rolls over to stats from a lower value (possibly starting from zero).

Question:
Why is there a inconsistent update count shown in the asset tab?