[Flaky Test]: TestStandaloneUpgradeRollbackOnRestarts – failed waiting for healthy agent and version (context deadline exceeded): could not unmarshal agent status output: unexpected end of JSON input #6733
Description
Failing test case
TestStandaloneUpgradeRollbackOnRestarts
Error message
failed waiting for healthy agent and version (context deadline exceeded): could not unmarshal agent status output: unexpected end of JSON input
Build
OS
Windows
Stacktrace and notes
According to the watcher logs the upgrade is not rolled back as expected
In the diagnostics we only find 9.0.0-SNAPSHOT logs (the test performs 8.18.0-SNAPSHOT -> 9.0.0-SNAPSHOT upgrade, rolled back to 8.18.0-SNAPSHOT) so it seems that 8.18.0 has been cleaned up confirmed by this watcher log
{"log.level":"info","@timestamp":"2025-02-06T10:21:27.713Z","log.origin":{"function":"github.com/elastic/elastic-agent/internal/pkg/agent/application/upgrade.cleanup","file.name":"upgrade/rollback.go","file.line":132},"message":"Removing hashed data directory","file.path":"C:\\Program Files\\Elastic\\Agent\\data\\elastic-agent-8.18.0-SNAPSHOT-eb771e","ecs.version":"1.6.0"}
The interesting bit is that the watcher stated that the grace period is passed after about a minute, during which there are some connection errors, HEALTHY and STOPPED states, but not enough to trigger a rollback.