Fixing small issues

Closes #68
Closes #69 (except the 'edit' part which I cannot find)

Also updates the README.md wrt how it's deployed.

README.md

@@ -3,15 +3,33 @@
 The user setup behind [stats.c4dt.org](https://stats.c4dt.org).
 
 At root, it contains a bunch of script to run measurement, each regularly
-started by an user systemd timer, found in `.config`.
+started by a user systemd timer, found in `.config`.
 The timers output the results in a graphite database and shown in a grafana.
 Both are handle by the root `docker-compose.yaml`.
 To add or modify grafana's panels, look in `data/grafana`.
 
-Deployment is done via Github Actions, which do:
-
-- rsync of the repo to the home directory of the user on the stats' server
-- stop all timers of the user
-- start timers in the repo
+Deployment is done via ansible: [stats role](https://github.com/c4dt/ansible-config/tree/main/playbooks/roles/stats)
 
 If you need help with systemd, there is a [Systemd Cheatsheet](README.systemd.md)
+
+## Testing
+
+To test the new values, the easiest way is to do the following:
+
+- ssh to the stats-server, then
+
+```bash
+sudo -iu stats
+git pull
+git checkout your_branch
+make
+```
+
+Once you've finished testing, don't forget to
+
+```bash
+git checkout main
+make
+```
+
+And then re-apply ansible.

dashboards-to-provision/servers.dashboard.py

@@ -22,6 +22,8 @@
 from grafanalib.influxdb import InfluxDBTarget
 
 
+# the 'every' in the 'aggregateWindow' will always aggregate to 800 points,
+# no matter the range being shown.
 def target(server_name: str) -> InfluxDBTarget:
     """Generate Target for disk usage on given server"""
     return InfluxDBTarget(
@@ -33,7 +35,7 @@ def target(server_name: str) -> InfluxDBTarget:
             |> filter(fn: (r) => r.host == "{server_name}")
             |> filter(fn: (r) => r._field == "used_percent")
             |> keep(columns: ["_time", "_value", "path"])
-            |> last()
+            |> aggregateWindow(every: duration(v:(uint(v: v.timeRangeStop) - uint(v: v.timeRangeStart))/uint(v: 800)), fn: mean)
         """,
     )
 

dashboards-to-provision/services/drand.dashboard.py

@@ -29,9 +29,9 @@
             "drand: CPU usage",
             Target(target="drand.get-cpu-percentage"),
             GridPos(h=8, w=12, x=12, y=8),
-            UNITS.PERCENT_FORMAT,
+            UNITS.NO_FORMAT,
             frequency=1 * 60,
-            alert_at=1.5,
+            alert_at=10,
         ),
         simple_graph(
             "drand.c4dt.org: TTY activity",