doc/user/content/releases/v0.38.md
Add cpu_percent_normalized to the mz_internal.mz_{source,sink,cluster_replica}_utilization
system catalog views. This column provides an approximation of CPU utilization
as a % of the total of compute workers.
Add mz_internal.mz_cluster_replica_frontiers
to the system catalog. This table describes the frontiers of each
dataflow in the system.
Private preview. Support the AS OF and UP TO
clauses in SUBSCRIBE. These clauses allow specifying a timestamp at
which SUBSCRIBE should begin returning results (AS OF), or cease
running (UP TO).
As is, all user-defined sources and tables have a retention window of one
second, so AS OF is of limited use beyond subscribing to queries over
specific system catalog objects (including mz_cluster_replicas,
mz_sources, mz_sinks, mz_internal.mz_cluster_replica_metrics, and
mz_internal.mz_cluster_replica_sizes).