Drop dev Grafana integration

CONTRIBUTING.md

@@ -471,30 +471,6 @@ and if not found, tries to download wheel from PyPI.
 Use top level `make dist` to generate wheels.
 
 
-## Testing with Grafana
-
-temBoard exposes /metrics in OpenMetric format. Development environment
-includes Prometheus and Grafana preconfigured with authenticated access and
-file-based service discovery. You only need a couple of steps to view temBoard
-metrics in Grafana.
-
-- Start development temBoard UI and at lease one of agent0 or agent1.
-- Generate Prometheus targets using `make prom-targets`.
-- Go to [development Grafana import page](http://localhost:3000/dashboard/import).
-- Import Dashboard ID [1860](https://grafana.com/grafana/dashboards/1860)
-  (*Node Exporter Full*) or [9628](https://grafana.com/grafana/dashboards/1860)
-  (*PostgreSQL Database*).
-- Now wait a few minutes that Prometheus scrapes data. Scrape interval is 1
-  minute.
-
-temBoard exposes only a subset of metrics from node\_exporter and
-postgres\_exporter, plus a set of custom metrics prefixed with `x`, e.g.
-`xpg_wal_files_bytes_total`. Thus a lot of panel will show *N/A*.
-
-Prometheus also watch `dev/prometheus/targets/custom.yaml` files for hand
-written targets.
-
-
 ## Investigate logs with lnav
 
 [lnav] is an awesome tool to browse and analyze log files.

Makefile

@@ -69,7 +69,7 @@ ui/build/bin/prometheus ui/build/bin/promtool: dev/downloads/prometheus-$(PROMET
 clean:  #: Trash venv and containers.
 	docker compose down --volumes --remove-orphans
 	docker rmi --force dalibo/temboard-agent:dev
-	rm -rf dev/venv-py* .venv-py* dev/build/ dev/prometheus/targets/temboard-dev.yaml
+	rm -rf dev/venv-py* .venv-py* dev/build/
 	rm -vf ui/build/bin/prometheus ui/build/bin/promtool
 	rm -rf agent/build/ .env agent/.coverage
 	rm -rvf ui/build/ ui/.coverage
@@ -128,10 +128,6 @@ tests:  #: Execute all tests.
 clean-tests:  #: Clean tests runtime files
 	rm -rf tests/downloads/ tests/logs/ tests/screenshots/
 
-prom-targets: dev/prometheus/targets/temboard-dev.yaml  #: Generate Prometheus dev targets.
-dev/prometheus/targets/temboard-dev.yaml: dev/bin/mktargets .env
-	$^ > $@
-
 VERSION=$(shell cd ui; python3 setup.py --version)
 BRANCH?=master
 # When stable branch v8 is created, use this:

dev/grafana/rootfs/etc/grafana/provisioning/dashboards/perf.yaml

@@ -7,15 +7,3 @@ providers:
   allowUiUpdates: true
   options:
     path: /usr/share/temboard/perf.json
-- name: "Postgres from temBoard agent"
-  type: file
-  folder: ''
-  allowUiUpdates: true
-  options:
-    path: /usr/share/temboard/postgres.json
-- name: "temBoard Prometheus"
-  type: file
-  folder: ''
-  allowUiUpdates: true
-  options:
-    path: /usr/share/temboard/temboard-prometheus.json