[modular] Add one more variant of the session creation metric.

Bug: 45946,48782
Change-Id: I4665a34058dda16f6bd2fe145e281c474641b2de
Reviewed-on: https://fuchsia-review.googlesource.com/c/cobalt-registry/+/384224
Reviewed-by: Mitch Rudominer <rudominer@google.com>
Commit-Queue: Jody Sankey <jsankey@google.com>
diff --git a/fuchsia/modular/metrics.yaml b/fuchsia/modular/metrics.yaml
index 56a8451..7d51bd3 100644
--- a/fuchsia/modular/metrics.yaml
+++ b/fuchsia/modular/metrics.yaml
@@ -37,6 +37,9 @@
         # A session was created where the standard account ID = 0
         # directory was successfully found.
         6: CreateSessionExistingFixedAccount
+        # A session was created where the standard account ID = 0
+        # directory was successfully used, but others also existed.
+        7: CreateSessionUnverifiableFixedAccount
       max_event_code: 10
   reports:
     #####################################################################