The inspect_metrics end to end tests ensure that expected data is present in the Inspect output of particular components.
Inspect is used to report per-component health and status. The values tested in this E2E test are needed by downstream components for reporting.
This test ensures that the expected data is available on real systems, which is not covered by integration tests.
Each of the listed components below expose Inspect data that is read through the Archivist for the test.
The Archivist is the core of the Component Diagnostics platform. It is responsible for handling requests for diagnostics data from components and returning it in a structured payload.
These E2E tests all read Inspect data directly from the Archivist and ensure that expected values are set for individual components.
The Archivist exposes diagnostics data about itself, which is asserted in archivist_metrics_test.dart.
The Archivist provides interfaces for All data and data filtered for indiviual use cases. The archivist_reader_test.dart checks that these pipelines are usable.
Integration and unit tests for this functionality are present at //src/diagnostics/archivist/tests
archivist_reader_test.dart and inspect_metrics_test.dart assert that filesystem usage stats are exposed by the fshost component through the Archivist.
blobfs_metrics_test.dart asserts that blobfs stats are exposed by the fshost component through the Archivist.
Unit tests for this functionality are present at //src/storage/fshost/inspect-manager-test.cc
archivist_reader_test.dart asserts that memory usage is exposed by the memory_monitor component through the Archivist.
Unit tests for this functionality are present at //src/developer/memory/monitor/tests/
appmgr is responsible for running the V1 components hierarchy. On behalf of those components, it exposes the last hour of CPU usage sampled every minute.
appmgr_cpu_metrics_test.dart asserts the data is exposed by appmgr through the Archivist.
Unit tests for this functionality are present at //src/sys/appmgr/cpu_watcher_unittest.cc