PackageMetrics.package_load_metrics
Loading time metrics per package.
PackageMetrics.packages_loaded
Number of BUILD files (aka packages) successfully loaded during this build.
[For Bazel binaries built at source states] Before Dec 2021, this value
was the number of packages attempted to be loaded, for a particular
definition of “attempted”.
After Dec 2021, this value would sometimes overcount because the same
package could sometimes be attempted to be loaded multiple times due to
memory pressure.
After Feb 2022, this value is the number of packages successfully
loaded.