add owned_by_superuser field to filter out system extensions.
While on it, also correct related code:
- fix the metric setting: use set() instead of inc() in a loop.
inc() is not idempotent and can lead to incorrect results
if the function called multiple times. Currently it is only called at
compute start, but this will change soon.
- fix the return type of the installed_extensions endpoint
to match the metric. Currently it is only used in the test.
to keep it consistent with existing compute metrics.
flux-fleet change is not needed, because it doesn't have any filter by
metric name for compute metrics.
and add /metrics endpoint to compute_ctl to expose such metrics
metric format example for extension pg_rag
with versions 1.2.3 and 1.4.2
installed in 3 and 1 databases respectively:
neon_extensions_installed{extension="pg_rag", version="1.2.3"} = 3
neon_extensions_installed{extension="pg_rag", version="1.4.2"} = 1
------
infra part: https://github.com/neondatabase/flux-fleet/pull/251
---------
Co-authored-by: Tristan Partin <tristan@neon.tech>
Add /installed_extensions endpoint to collect
statistics about extension usage.
It returns a list of installed extensions in the format:
```json
{
"extensions": [
{
"extname": "extension_name",
"versions": ["1.0", "1.1"],
"n_databases": 5,
}
]
}
```
---------
Co-authored-by: Heikki Linnakangas <heikki@neon.tech>
