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test failed in CI: test_self_stat_collection_count #8636

@jgallagher

Description

@jgallagher

This test failed on a CI run on #8627:

https://github.com/oxidecomputer/omicron/pull/8627/checks?check_run_id=46208988376

Log showing the specific test failure:

https://buildomat.eng.oxide.computer/wg/0/details/01K0CYCJ10M4HYQ5TJDRNFFTRX/GkU4qFcnvjiE6MOKLpiGpI1Yu5sJbshKlC1KNbKPVprBXJyB/01K0CYDK2VDM6GQS0Z5CQYYQYW

Excerpt from the log showing the failure:

7923	2025-07-17T21:06:32.078Z	  stdout ───
7924	2025-07-17T21:06:32.078Z	
7925	2025-07-17T21:06:32.078Z	    running 1 test
7926	2025-07-17T21:06:32.078Z	    test agent::tests::test_self_stat_collection_count ... FAILED
7927	2025-07-17T21:06:32.078Z	
7928	2025-07-17T21:06:32.078Z	    failures:
7929	2025-07-17T21:06:32.078Z	
7930	2025-07-17T21:06:32.078Z	    failures:
7931	2025-07-17T21:06:32.078Z	        agent::tests::test_self_stat_collection_count
7932	2025-07-17T21:06:32.078Z	
7933	2025-07-17T21:06:32.078Z	    test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 7 filtered out; finished in 1.86s
7934	2025-07-17T21:06:32.078Z	    
7935	2025-07-17T21:06:32.078Z	  stderr ───
7936	2025-07-17T21:06:32.079Z	    log file: /var/tmp/omicron_tmp/oximeter_collector-ce92baab1eaac757-test_self_stat_collection_count.4000.0.log
7937	2025-07-17T21:06:32.079Z	    note: configured to log to "/var/tmp/omicron_tmp/oximeter_collector-ce92baab1eaac757-test_self_stat_collection_count.4000.0.log"
7938	2025-07-17T21:06:32.079Z	
7939	2025-07-17T21:06:32.079Z	    thread 'agent::tests::test_self_stat_collection_count' panicked at oximeter/collector/src/agent.rs:844:9:
7940	2025-07-17T21:06:32.079Z	    assertion failed: stats.failed_collections.is_empty()

We previously had this test flaking in #4657 but it looks like this is a different assert failing, so figured it was worth a new issue rather than reopening.

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