docs: add information about distros key
@@ -187,6 +187,7 @@ Here's an example `kola.json`:
```json
{
"architectures": "!s390x ppc64le",
+ "distros": "fcos",
"platforms": "qemu-unpriv",
"tags": "sometagname needs-internet skip-base-checks othertag",
"requiredTag": "special",
@@ -204,7 +205,10 @@ string (instead of a native JSON list) is twofold. First, it's easier to type
than a JSON list, and we don't need to support values with whitespace. Second,
for `architectures` and `platforms` by providing `!` at the front of the
string, the value instead declares exclusions i.e. `ExclusiveArchitectures`
-instead of `Architectures` in reference to kola internals.
+instead of `Architectures` in reference to kola internals. The `distros` tag
+can be used to restrict a test to run on just one distribution, either `fcos` or
+`rhcos`. By default, tests will run on all distributions. (Typically, the
+`distros` key is used to restrict a test to just `fcos`.)
In this example, `sometagname` and `othertag` are arbitrary tags one can use
with `kola run --tag`, but some tags have semantic meaning.
