Prometheus: Implement suggestions by CodeRabbit

Author: amotl

docs/integrate/prometheus/compose.yaml

@@ -12,6 +12,11 @@ services:
       - "5432:5432"
     volumes:
       - cratedb-data:/data
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:4200/"]
+      interval: 5s
+      timeout: 30s
+      retries: 5
     restart: unless-stopped
 
   cratedb-ddl:

docs/integrate/prometheus/usage.md

@@ -30,6 +30,7 @@ docker compose up
 ## Explore data
 
 CrateDB stores the metrics in the designated table, ready for inspection and analysis.
+By default, the included `ddl.sql` creates the table `testdrive.metrics`.
 ```shell
 docker compose exec cratedb crash -c "SELECT * FROM testdrive.metrics ORDER BY timestamp LIMIT 5;"
 ```
@@ -44,22 +45,19 @@ Confirm that Prometheus monitors itself.
 
 ![Prometheus target details for the self-scrape job](https://us1.discourse-cdn.com/flex020/uploads/crate/original/1X/57ccb5374b0ab524466de08feefbafde559dac87.png)
 
-Return to the CrateDB Admin UI and select the `metrics` table you created.
+Return to the CrateDB Admin UI at `http://localhost:4200` and select the `testdrive.metrics` table.
 
-After a few minutes, Prometheus will have gathered a few thousands of data points.
+After a few minutes, Prometheus will have gathered a few thousand data points.
 
 ![CrateDB Admin UI showing the populated metrics table](https://us1.discourse-cdn.com/flex020/uploads/crate/original/1X/22e8c7d5a90ec9240a4cb4269774e143759aa92e.jpeg)
 
 Use CrateDB’s query engine to analyze and visualize this data with tools
-like {ref}`grafana`, see also
+like {ref}`grafana`. See also
 [Monitoring a self-managed CrateDB cluster with Prometheus and Grafana].
 
 
 [CrateDB]: https://cratedb.com/database
 [CrateDB Prometheus Adapter]: https://github.com/crate/cratedb-prometheus-adapter
-[Docker Compose]: https://docs.docker.com/compose/
-[Docker containers]: https://www.docker.com/resources/what-container
-[Docker installation guide]: https://docs.docker.com/get-docker/
 [Monitoring a self-managed CrateDB cluster with Prometheus and Grafana]: https://community.cratedb.com/t/monitoring-a-self-managed-cratedb-cluster-with-prometheus-and-grafana/1236
 [Prometheus]: https://prometheus.io/docs/introduction/overview/
 [Prometheus documentation]: https://prometheus.io/docs/prometheus/latest/getting_started/