We use the Namespace in Cloud Datastore to differentiate applications (Perf, Gold) and different installations of the same application (Perf, Perf-Android, Gold, Gold-PDFium). Since there may end up being many namespaces, a naming convention has been established:
<app>[-<instance>] <app>-localhost-<user>
Where ‘instance’ is the name of the instance, or blank if there is a canonical instance.
Examples:
perf perf-androidmaster perf-localhost-jcgregorio gold gold-pdfium gold-localhost-stephana
Composite Indexes for all applications are defined in ds/index.yaml. Keeping the indexes in a single location makes it possible to run gcloud datastore cleanup-indexes.