collectd: Implement suggestions by CodeRabbit

Author: amotl

docs/integrate/collectd/Dockerfile

@@ -4,8 +4,7 @@ FROM docker.io/debian:13-slim
 ENV DEBIAN_FRONTEND=noninteractive
 
 # Install collectd.
-RUN apt update --yes
-RUN apt install --yes collectd
+RUN apt update --yes && apt install --yes collectd
 
 # Run collectd in foreground.
 ENTRYPOINT ["collectd", "-f"]

docs/integrate/collectd/collectd-cratedb.conf

@@ -10,6 +10,7 @@ LoadPlugin postgresql
         </Writer>
         <Database cratedb>
                 Writer sqlstore
+                # Commit every 30 seconds (adjust based on write volume)
                 CommitInterval 30
                 Host cratedb
                 User crate

docs/integrate/collectd/collectd-telegraf.conf

@@ -3,4 +3,6 @@
 
 <Plugin "network">
   Server "telegraf"
+  # Optional: ServerPort 25826
+  # Optional: SecurityLevel "sign" or "encrypt"
 </Plugin>

docs/integrate/collectd/tutorial-telegraf.md

@@ -58,7 +58,7 @@ docker run --name=cratedb --rm -it --network=cratedb-demo \
 
 collectd is not available per OCI image, so either install standalone,
 or use these instructions for building an OCI to invoke on Docker or Podman.
-Store this file under the name `Dockername`, then invoke the command
+Store this file under the name `Dockerfile`, then invoke the command
 displayed below.
 
 :::{literalinclude} Dockerfile