feat: add grafana deployment details

.github/dependabot.yml

@@ -11,3 +11,8 @@ updates:
     directory: "/"
     schedule:
       interval: "monthly"
+
+  - package-ecosystem: "docker"
+    directory: "grafana/"
+    schedule:
+      interval: "weekly"

grafana/Dockerfile

@@ -0,0 +1,4 @@
+# TODO: set specific SHA of image & enable dependabot
+FROM grafana/grafana-enterprise:latest@sha256:0d33bf1b2c3d508c5345ca652a96676c119420c4474e90299e4703ee834ade70
+
+USER grafana

grafana/README.md

@@ -0,0 +1,99 @@
+# Grafana deployment instructions
+## Create app
+
+```bash
+dokku$ dokku apps:create grafana
+dokku$ dokku domains:add grafana dashboards.opensafely.org
+dokku$ dokku git:set grafana deploy-branch main
+dokku$ dokku builder-dockerfile:set grafana dockerfile-path grafana/Dockerfile
+```
+
+## Create postgresql db for grafana
+
+* on DO db cluster
+  * postgresql version to match target server - currently 14 on dokku3
+
+## create persistent storage
+
+```bash
+# dokku will create this with uid:gid as 32767:32767 & then the container will be unable to write
+dokku$ dokku storage:ensure-directory grafana
+dokku storage:mount grafana /var/lib/dokku/data/storage/grafana:/var/lib/grafana
+
+# the grafana container runs as uid 472 (grafana)
+# the other dokku containers on dokku3 run as uid 1013 (dokku)
+# let's tell the container to run as 1013, then we can use the same file permissions 
+dokku$ dokku docker-options:add grafana deploy "--user 1013"
+dokku$ dokku docker-options:add grafana run "--user 1013"
+myuser$ sudo chown -R dokku:dokku /var/lib/dokku/data/storage/grafana
+
+dokku$ dokku storage:mount grafana /var/lib/dokku/data/storage/grafana:/var/lib/grafana
+```
+
+## Configure app
+
+```bash
+dokku config:set grafana GF_DATABASE_TYPE="postgres"
+dokku config:set grafana GF_DATABASE_HOST="xxx:5432"
+dokku config:set grafana GF_DATABASE_NAME="grafana"
+dokku config:set grafana GF_DATABASE_USER="grafana"
+dokku config:set grafana GF_DATABASE_PASSWORD="xxx"
+dokku config:set grafana GF_DATABASE_SSL_MODE="require"
+dokku config:set grafana GF_SERVER_ROOT_URL="https://dashboards.opensafely.org/"
+dokku config:set grafana GF_INSTALL_PLUGINS="grafana-github-datasource"
+```
+
+## Manually pushing
+
+* set up key on target server
+  * madwort adding his regular key for now - needs a better setup
+
+```bash
+local$ git clone [email protected]:opensafely-core/sysadmin.git
+local$ cd sysadmin
+local$ git remote add dokku dokku@MYSERVER:grafana
+local$ git push dokku main
+```
+
+## Letsencrypt
+
+```bash
+dokku$ dokku ports:add grafana http:80:3000
+# TODO: block access to port 3000?
+dokku$ dokku letsencrypt:enable grafana
+```
+
+## Create postgresql connection in Grafana
+
+### Configure user on postgresql db cluster
+
+* create `grafanareader` user on cluster in DigitalOcean control panel for primary node
+* by default `grafanareader` cannot connect to `jobserver` database
+* connect to primary node with psql & allow connections:
+
+```sql
+GRANT CONNECT ON database jobserver TO grafanareader;
+```
+
+* `grafanareader` will still fail with e.g. "db query error: pq: permission denied for table applications_application"
+* configure access as required:
+
+```sql
+GRANT SELECT ON applications_application, applications_cmoprioritylistpage, applications_commercialinvolvementpage, applications_datasetspage, applications_legalbasispage, applications_previousehrexperiencepage, applications_recordleveldatapage, applications_referencespage, applications_researcherregistration, applications_sharingcodepage, applications_sponsordetailspage, applications_studydatapage, applications_studyfundingpage, applications_studyinformationpage, applications_studypurposepage, applications_teamdetailspage, applications_typeofstudypage, interactive_analysisrequest, jobserver_backend, jobserver_backendmembership, jobserver_job, jobserver_jobrequest, jobserver_org, jobserver_orgmembership, jobserver_project, jobserver_projectmembership, jobserver_publishrequest, jobserver_release, jobserver_releasefile, jobserver_releasefilereview, jobserver_repo, jobserver_report, jobserver_snapshot, jobserver_snapshot_files, jobserver_stats, jobserver_workspace, redirects_redirect TO grafanareader;
+CREATE VIEW jobserver_user_grafana AS SELECT id,last_login,is_superuser,username,is_staff,is_active,date_joined,fullname,created_by_id,login_token_expires_at,pat_expires_at,roles FROM jobserver_user;
+GRANT SELECT ON jobserver_user_grafana TO grafanareader;
+```
+
+### Connect from Grafana
+
+In the Grafana UI:
+
+* Adminstration
+* Plugins
+* PostgreSQL
+* Add new data source
+* Enter `Host`, `Database`, `User`, `Password` from DigitalOcean db cluster read-only node `Connection Details`
+
+### Missing datasource
+
+If you import a Dashboard from a JSON file, the visualisations may error with "Could not find datasource $UUID". It is sometimes possible to fix this by some combination of hitting "Run query" & "Refresh", otherwise you could recreate the visulation by copy-pasting SQL etc.