Parsed test spec with 4 sessions

starting permutation: S1_lock S3_vacuum S2_lock S1_commit S4_drop_index S2_commit
step S1_lock: 
    LOCK TABLE _timescaledb_internal.metrics_chunk_2 IN ACCESS EXCLUSIVE MODE;

step S3_vacuum: 
    VACUUM ANALYZE _timescaledb_internal.metrics_chunk_2;
 <waiting ...>
step S2_lock: 
    LOCK TABLE _timescaledb_internal.metrics_chunk_2 IN ACCESS EXCLUSIVE MODE;
 <waiting ...>
step S1_commit: 
    COMMIT;

step S2_lock: <... completed>
step S4_drop_index: 
    DROP INDEX metrics_device_time_idx;
 <waiting ...>
step S2_commit: 
    COMMIT;

step S3_vacuum: <... completed>
step S4_drop_index: <... completed>
