[local_storage][compression_format] Increase step size to 20MB

The current step size for the histogram report is 5MB, which causes a
lot of hits in the Overflow bucket.

Change-Id: I1f7cb773ff87ecce1d0a71b2498a1e51b79f8b44
Reviewed-on: https://fuchsia-review.googlesource.com/c/cobalt-registry/+/378983
Reviewed-by: Mitch Rudominer <rudominer@google.com>
Commit-Queue: Rasha Eqbal <rashaeqbal@google.com>
diff --git a/fuchsia/local_storage/metrics.yaml b/fuchsia/local_storage/metrics.yaml
index a39ba4d..93c249c 100644
--- a/fuchsia/local_storage/metrics.yaml
+++ b/fuchsia/local_storage/metrics.yaml
@@ -499,7 +499,7 @@
       aggregation_type: MAX
       int_buckets:
         linear:
-          step_size: 5242880 # 5MB
+          step_size: 20971520 # 20MB
           num_buckets: 100
       window_size:
         - 1 # 1 day