Make random_bytes() enforce sane size limits
This makes random_bytes() refuse to generate more than 1MiB of data
at a time. This should almost never be necessary, and we have chased
actual gate OOM failures related to sloppy handling of even
moderately-sized test buffers.
Change-Id: I9cebe778a9309a0f4f5d78be97d062864e1849f1
diff --git a/releasenotes/notes/random-bytes-size-limit-ee94a8c6534fe916.yaml b/releasenotes/notes/random-bytes-size-limit-ee94a8c6534fe916.yaml
new file mode 100644
index 0000000..42322e4
--- /dev/null
+++ b/releasenotes/notes/random-bytes-size-limit-ee94a8c6534fe916.yaml
@@ -0,0 +1,9 @@
+---
+upgrade:
+ - |
+ The ``tempest.lib.common.utils.data_utils.random_bytes()`` helper
+ function will no longer allow a ``size`` of more than 1MiB. Tests
+ generally do not need to generate and use large payloads for
+ feature verification and it is easy to lose track of and duplicate
+ large buffers. The sum total of such errors can become problematic
+ in paralllelized and constrained CI environments.