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The `filter.lttngtest.event_name` plugin only has a single input and output port.
This means that it cannot be connected directly to a `source.ctf.fs` plugin, as
those have multiple output ports for the different event streams.
A `filter.utils.muxer` plugin must be placed between any multi-output port plugin
and the `filter.lttngtest.event_name` plugin. This is done automatically with in
the architecture created by `babeltrace2 convert`.
Example with `babeltrace2 convert`:
```
SOURCE_PATH=/tmp/tmp.1J5DueCziG
EVENT_NAME=tp:the_string
babeltrace2 --plugin-path=.libs/ convert "${SOURCE_PATH}" -c filter.lttngtest.event_name -p "names=[\"$EVENT_NAME\"]" -c sink.lttngtest.field_stats
```
Example with `babeltrace2 run`:
```
SOURCE_PATH=/tmp/tmp.1J5DueCziG
EVENT_NAME=tp:the_string
babeltrace2 --plugin-path=.libs/ run -c A:source.ctf.fs -p "inputs=[\"$SOURCE_PATH\"]" -c muxer:filter.utils.muxer -c B:filter.lttngtest.event_name -p "names=[\"$EVENT_NAME\"]" -c C:sink.lttngtest.field_stats -x A:muxer -x muxer:B -x B:C
```
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