mirror of
https://mau.dev/maunium/synapse.git
synced 2024-11-14 14:01:59 +01:00
63 lines
2.2 KiB
Markdown
63 lines
2.2 KiB
Markdown
|
Room and User Statistics
|
|||
|
|
========================
|
|||
|
|
|
|||
|
|
Synapse maintains room and user statistics (as well as a cache of room state),
|
|||
|
|
in various tables. These can be used for administrative purposes but are also
|
|||
|
|
used when generating the public room directory.
|
|||
|
|
|
|||
|
|
|
|||
|
|
# Synapse Developer Documentation
|
|||
|
|
|
|||
|
|
## High-Level Concepts
|
|||
|
|
|
|||
|
|
### Definitions
|
|||
|
|
|
|||
|
|
* **subject**: Something we are tracking stats about – currently a room or user.
|
|||
|
|
* **current row**: An entry for a subject in the appropriate current statistics
|
|||
|
|
table. Each subject can have only one.
|
|||
|
|
* **historical row**: An entry for a subject in the appropriate historical
|
|||
|
|
statistics table. Each subject can have any number of these.
|
|||
|
|
|
|||
|
|
### Overview
|
|||
|
|
|
|||
|
|
Stats are maintained as time series. There are two kinds of column:
|
|||
|
|
|
|||
|
|
* absolute columns – where the value is correct for the time given by `end_ts`
|
|||
|
|
in the stats row. (Imagine a line graph for these values)
|
|||
|
|
* They can also be thought of as 'gauges' in Prometheus, if you are familiar.
|
|||
|
|
* per-slice columns – where the value corresponds to how many of the occurrences
|
|||
|
|
occurred within the time slice given by `(end_ts − bucket_size)…end_ts`
|
|||
|
|
or `start_ts…end_ts`. (Imagine a histogram for these values)
|
|||
|
|
|
|||
|
|
Stats are maintained in two tables (for each type): current and historical.
|
|||
|
|
|
|||
|
|
Current stats correspond to the present values. Each subject can only have one
|
|||
|
|
entry.
|
|||
|
|
|
|||
|
|
Historical stats correspond to values in the past. Subjects may have multiple
|
|||
|
|
entries.
|
|||
|
|
|
|||
|
|
## Concepts around the management of stats
|
|||
|
|
|
|||
|
|
### Current rows
|
|||
|
|
|
|||
|
|
Current rows contain the most up-to-date statistics for a room.
|
|||
|
|
They only contain absolute columns
|
|||
|
|
|
|||
|
|
### Historical rows
|
|||
|
|
|
|||
|
|
Historical rows can always be considered to be valid for the time slice and
|
|||
|
|
end time specified.
|
|||
|
|
|
|||
|
|
* historical rows will not exist for every time slice – they will be omitted
|
|||
|
|
if there were no changes. In this case, the following assumptions can be
|
|||
|
|
made to interpolate/recreate missing rows:
|
|||
|
|
- absolute fields have the same values as in the preceding row
|
|||
|
|
- per-slice fields are zero (`0`)
|
|||
|
|
* historical rows will not be retained forever – rows older than a configurable
|
|||
|
|
time will be purged.
|
|||
|
|
|
|||
|
|
#### Purge
|
|||
|
|
|
|||
|
|
The purging of historical rows is not yet implemented.
|