ci: investigate slow cleanup times.

.github/workflows/build-test.yml

@@ -36,9 +36,19 @@ jobs:
       # hosted Github Actions runners don't offer much space. Clean up unused
       # dependencies so that we don't run out of disk. Borrowed from
       # https://carlosbecker.com/posts/github-actions-disk-space.
+      #
+      # Note: deleting these directories can be very slow, so we only remove
+      # enough to allow the build to complete. We'll drop this workaround and
+      # get better build times once we switch to self-hosted runners with
+      # persistent storage and more disk.
       - name: "cleanup"
         run: |
-          sudo rm -rf /usr/share/dotnet /usr/local/lib/android /opt/ghc /opt/hostedtoolcache/CodeQL
+          time du -sh /usr/share/dotnet
+          time du -sh /opt/hostedtoolcache/CodeQL
+
+          time sudo rm -rf /usr/share/dotnet
+          time sudo rm -rf /opt/hostedtoolcache/CodeQL
+
           sudo docker image prune --all --force
           sudo docker builder prune -a
       - uses: actions/checkout@v5

acctest/nexus-config.toml

@@ -98,13 +98,16 @@ metrics_producer_gc.period_secs = 60
 external_endpoints.period_secs = 60
 nat_cleanup.period_secs = 30
 bfd_manager.period_secs = 30
+# How frequently to check for a new inventory collection (made by any Nexus).
+# This is cheap, so we should check frequently.
+inventory.period_secs_load = 15
 # How frequently to collect hardware/software inventory from the whole system
 # (even if we don't have reason to believe anything has changed).
-inventory.period_secs = 600
+inventory.period_secs_collect = 600
 # Maximum number of past collections to keep in the database
 inventory.nkeep = 5
 # Disable inventory collection altogether (for emergencies)
-inventory.disable = false
+inventory.disable_collect = false
 phantom_disks.period_secs = 30
 physical_disk_adoption.period_secs = 30
 support_bundle_collector.period_secs = 30