Use unique IDs for all existing doc pages

- what_is didn't have an id, started with 1000 (it's easier to find this file now)
- operator-manual doc id was clashing with ci use-case

Signed-off-by: Gerhard Lazu <gerhard@lazu.co.uk>

docs/administrator/1013-operator-manual.md

@@ -0,0 +1,45 @@
+---
+slug: /1013/operator-manual/
+---
+
+# Dagger Operator Manual
+
+## Custom buildkit setup
+
+Dagger can be configured to use an existing buildkit daemon, running either locally or remotely. This can be done using two environment variables: `BUILDKIT_HOST` and `DOCKER_HOST`.
+
+To use a buildkit daemon listening on TCP port `1234` on localhost:
+
+```shell
+export BUILDKIT_HOST=tcp://localhost:1234
+```
+
+To use a buildkit daemon running in a container named "super-buildkit" on the local docker host:
+
+```shell
+export BUILDKIT_HOST=docker-container://super-buildkit
+```
+
+To use a buildkit daemon running on a remote docker host (be careful to properly secure remotely accessible docker hosts!)
+
+```shell
+export BUILDKIT_HOST=docker-container://super-buildkit
+export DOCKER_HOST=tcp://my-remote-docker-host:2376
+```
+
+## OpenTracing Support
+
+Both Dagger and buildkit support opentracing. To capture traces to
+[Jaeger](https://github.com/jaegertracing/jaeger), set the `JAEGER_TRACE` environment variable to the collection address.
+
+A `docker-compose` file is available to help bootstrap the tracing environment:
+
+```shell
+docker-compose -f ./dagger-main/tracing.compose.yaml up -d
+export JAEGER_TRACE=localhost:6831
+export BUILDKIT_HOST=docker-container://dagger-buildkitd-jaeger
+
+dagger up
+```
+
+You can then go to [http://localhost:16686/](http://localhost:16686/) in your browser to see the traces.