@flamber For MySQL, I'm not sure why it's getting reported as 5.6.x, but we're using MySQL DB on Azure as application database with MySQL version as 8.0.
For JAVA upgrade, can you please suggest which LTS version is most compatible with the installed metabase version 0.38.3 ?
I pulled some metabase logs just before when it went down.
Apr 27 10:42:09 prod-metabase-01 metabase[1419]: 2021-04-27 10:42:09,230 DEBUG middleware.log :: #033[32mPOST /api/card/26/query 202 [ASYNC: completed] 3.4 s (10 DB calls) App DB connections: 7/15 Jetty threads: 3/50 (17 idle, 0 queued) (162 total active threads) Queries in flight: 5 (0 queued)#033[0m
Apr 27 10:42:09 prod-metabase-01 metabase[1419]: 2021-04-27 10:42:09,230 DEBUG middleware.log :: #033[32mPOST /api/card/7/query 202 [ASYNC: completed] 3.7 s (13 DB calls) App DB connections: 7/15 Jetty threads: 2/50 (18 idle, 0 queued) (162 total active threads) Queries in flight: 5 (0 queued)#033[0m
Apr 27 10:42:09 prod-metabase-01 metabase[1419]: 2021-04-27 10:42:09,392 DEBUG middleware.log :: #033[32mPOST /api/card/29/query 202 [ASYNC: completed] 3.8 s (14 DB calls) App DB connections: 7/15 Jetty threads: 2/50 (18 idle, 0 queued) (162 total active threads) Queries in flight: 4 (0 queued)#033[0m
Apr 27 10:42:09 prod-metabase-01 metabase[1419]: 2021-04-27 10:42:09,395 DEBUG middleware.log :: #033[32mPOST /api/card/21/query 202 [ASYNC: completed] 3.7 s (10 DB calls) App DB connections: 6/15 Jetty threads: 5/50 (16 idle, 0 queued) (162 total active threads) Queries in flight: 3 (0 queued)#033[0m
Apr 27 10:42:09 prod-metabase-01 metabase[1419]: 2021-04-27 10:42:09,558 DEBUG middleware.log :: #033[32mPOST /api/card/6/query 202 [ASYNC: completed] 4.0 s (12 DB calls) App DB connections: 6/15 Jetty threads: 2/50 (18 idle, 0 queued) (162 total active threads) Queries in flight: 2 (0 queued)#033[0m
Apr 27 10:42:09 prod-metabase-01 metabase[1419]: 2021-04-27 10:42:09,587 DEBUG middleware.log :: #033[32mPOST /api/card/9/query 202 [ASYNC: completed] 3.8 s (15 DB calls) App DB connections: 6/15 Jetty threads: 6/50 (15 idle, 0 queued) (162 total active threads) Queries in flight: 1 (0 queued)#033[0m
Apr 27 10:42:09 prod-metabase-01 metabase[1419]: 2021-04-27 10:42:09,743 DEBUG middleware.log :: #033[32mPOST /api/card/19/query 202 [ASYNC: completed] 4.2 s (18 DB calls) App DB connections: 5/15 Jetty threads: 2/50 (18 idle, 0 queued) (162 total active threads) Queries in flight: 0 (0 queued)#033[0m
Apr 27 10:42:34 prod-metabase-01 metabase[1419]: 2021-04-27 10:42:34,241 DEBUG middleware.log :: #033[32mGET /api/database/12/metadata 200 549.9 ms (13 DB calls) App DB connections: 1/15 Jetty threads: 3/50 (17 idle, 0 queued) (162 total active threads) Queries in flight: 0 (0 queued)#033[0m
Apr 27 10:52:10 prod-metabase-01 metabase[1419]: 2021-04-27 10:52:10,837 INFO sync.util :: #033[35mFINISHED: step 'sync-metabase-metadata' for googleanalytics Database 11 'GA - ONE' (22.3 mins)#033[0m
Apr 27 10:52:11 prod-metabase-01 metabase[1419]: 2021-04-27 10:52:11,941 INFO sync.util :: #033[35mFINISHED: Sync metadata for googleanalytics Database 11 'GA - ONE' (42.8 mins)#033[0m
Apr 27 10:52:11 prod-metabase-01 metabase[1419]: 2021-04-27 10:52:11,946 INFO sync.util :: #033[35mSTARTING: Analyze data for googleanalytics Database 11 'GA - ONE'#033[0m
Apr 27 10:52:11 prod-metabase-01 metabase[1419]: 2021-04-27 10:52:11,999 INFO sync.util :: #033[35mSTARTING: step 'fingerprint-fields' for googleanalytics Database 11 'GA - ONE'#033[0m
Apr 27 10:52:12 prod-metabase-01 metabase[1419]: 2021-04-27 10:52:12,000 INFO sync.analyze :: #033[34mfingerprint-fields Analyzed [*****·················?
····························] 10% Table 175 '199474617'#033[0m
Apr 27 10:52:12 prod-metabase-01 metabase[1419]: 2021-04-27 10:52:12,003 INFO sync.analyze :: #033[34mfingerprint-fields Analyzed [**********··············??
?·························] 20% Table 183 '216304428'#033[0m
Apr 27 10:52:12 prod-metabase-01 metabase[1419]: 2021-04-27 10:52:12,004 INFO sync.analyze :: #033[34mfingerprint-fields Analyzed [***************············?
·······················] 30% Table 172 '236937490'#033[0m
Apr 27 10:52:12 prod-metabase-01 metabase[1419]: 2021-04-27 10:52:12,004 INFO sync.util :: #033[35mFINISHED: step 'fingerprint-fields' for googleanalytics Database 11 'GA - ONE' (5.6 ms)#033[0m
Apr 27 10:52:12 prod-metabase-01 metabase[1419]: 2021-04-27 10:52:12,005 INFO sync.util :: #033[35mSTARTING: step 'classify-fields' for googleanalytics Database 11 'GA - ONE'#033[0m
Apr 27 10:52:12 prod-metabase-01 metabase[1419]: 2021-04-27 10:52:12,022 INFO sync.analyze :: #033[34mclassify-fields Analyzed [********************···········?
···················] 40% Table 173 '199448438'#033[0m
Apr 27 10:52:12 prod-metabase-01 metabase[1419]: 2021-04-27 10:52:12,034 INFO sync.analyze :: #033[34mclassify-fields Analyzed [*************************········??
?················] 50% Table 174 '213375181'#033[0m
Apr 27 10:52:12 prod-metabase-01 metabase[1419]: 2021-04-27 10:52:12,046 INFO sync.analyze :: #033[34mclassify-fields Analyzed [******************************······?
··············] 60% Table 180 '236936896'#033[0m
Apr 27 10:52:12 prod-metabase-01 metabase[1419]: 2021-04-27 10:52:12,052 INFO sync.util :: #033[35mFINISHED: step 'classify-fields' for googleanalytics Database 11 'GA - ONE' (46.7 ms)#033[0m
Apr 27 10:52:12 prod-metabase-01 metabase[1419]: 2021-04-27 10:52:12,053 INFO sync.util :: #033[35mSTARTING: step 'classify-tables' for googleanalytics Database 11 'GA - ONE'#033[0m
Apr 27 10:52:12 prod-metabase-01 metabase[1419]: 2021-04-27 10:52:12,460 INFO sync.analyze :: #033[34mclassify-tables Analyzed [**********************************····?
············] 70% Table 182 '199442343'#033[0m
Apr 27 10:52:13 prod-metabase-01 metabase[1419]: 2021-04-27 10:52:13,240 INFO sync.analyze :: #033[34mclassify-tables Analyzed [****************************************·?
·········] 80% Table 178 '199483900'#033[0m
Apr 27 10:52:13 prod-metabase-01 metabase[1419]: 2021-04-27 10:52:13,989 INFO sync.analyze :: #033[34mclassify-tables Analyzed [********************************************······] 90% Table 176 '228770067'#033[0m
Apr 27 10:52:14 prod-metabase-01 metabase[1419]: 2021-04-27 10:52:14,569 INFO sync.util :: #033[35mFINISHED: step 'classify-tables' for googleanalytics Database 11 'GA - ONE' (2.5 s)#033[0m
Apr 27 10:52:15 prod-metabase-01 metabase[1419]: 2021-04-27 10:52:15,302 INFO sync.util :: #033[35mFINISHED: Analyze data for googleanalytics Database 11 'GA - ONE' (3.4 s)#033[0m
Apr 27 10:52:15 prod-metabase-01 metabase[1419]: 2021-04-27 10:52:15,304 INFO sync.util :: #033[35mSTARTING: Cache field values in googleanalytics Database 11 'GA - ONE'#033[0m
Apr 27 10:52:15 prod-metabase-01 metabase[1419]: 2021-04-27 10:52:15,305 INFO sync.util :: #033[35mSTARTING: step 'update-field-values' for googleanalytics Database 11 'GA - ONE'#033[0m
Apr 27 10:52:31 prod-metabase-01 metabase[1419]: 2021-04-27 10:52:31,262 INFO sync.util :: #033[35mFINISHED: step 'update-field-values' for googleanalytics Database 11 'GA - ONE' (16.0 s)#033[0m
Apr 27 10:52:31 prod-metabase-01 metabase[1419]: 2021-04-27 10:52:31,633 INFO sync.util :: #033[35mFINISHED: Cache field values in googleanalytics Database 11 'GA - ONE' (16.3 s)#033[0m
Apr 27 10:52:31 prod-metabase-01 metabase[1419]: 2021-04-27 10:52:31,633 INFO sync.util :: #033[35mFINISHED: Sync googleanalytics Database 11 'GA - ONE' (43.1 mins)#033[0m
Apr 27 11:00:00 prod-metabase-01 metabase[1419]: 2021-04-27 11:00:00,262 INFO task.send-pulses :: Sending scheduled pulses...
Apr 27 11:10:40 prod-metabase-01 metabase[1419]: 2021-04-27 11:10:40,147 WARN middleware.log :: #033[31mPOST /api/jsonws/invoke 404 111.1 µs (0 DB calls)
Apr 27 11:10:40 prod-metabase-01 metabase[1419]: "API endpoint does not exist."
Apr 27 11:10:40 prod-metabase-01 metabase[1419]: #033[0m
Apr 27 12:00:00 prod-metabase-01 metabase[1419]: 2021-04-27 12:00:00,197 INFO task.send-pulses :: Sending scheduled pulses...
Apr 27 13:00:00 prod-metabase-01 metabase[1419]: 2021-04-27 13:00:00,319 INFO task.send-pulses :: Sending scheduled pulses...
Apr 27 14:00:00 prod-metabase-01 metabase[1419]: 2021-04-27 14:00:00,212 INFO task.send-pulses :: Sending scheduled pulses...
Apr 27 15:00:00 prod-metabase-01 metabase[1419]: 2021-04-27 15:00:00,186 INFO task.send-pulses :: Sending scheduled pulses...
Apr 27 15:00:01 prod-metabase-01 metabase[1419]: 2021-04-27 15:00:01,121 INFO task.sync-databases :: Update Field values task triggered for Database 1.
Apr 27 15:00:01 prod-metabase-01 metabase[1419]: 2021-04-27 15:00:01,126 INFO sync.util :: #033[35mSTARTING: Cache field values in h2 Database 1 'Sample Dataset'#033[0m
Apr 27 15:00:01 prod-metabase-01 metabase[1419]: 2021-04-27 15:00:01,126 INFO sync.util :: #033[35mSTARTING: step 'update-field-values' for h2 Database 1 'Sample Dataset'#033[0m
Apr 27 15:00:03 prod-metabase-01 metabase[1419]: 2021-04-27 15:00:03,225 INFO sync.util :: #033[35mFINISHED: step 'update-field-values' for h2 Database 1 'Sample Dataset' (2.1 s)#033[0m
Apr 27 15:00:03 prod-metabase-01 metabase[1419]: 2021-04-27 15:00:03,460 INFO sync.util :: #033[35mFINISHED: Cache field values in h2 Database 1 'Sample Dataset' (2.3 s)#033[0m
Apr 27 16:00:00 prod-metabase-01 metabase[1419]: 2021-04-27 16:00:00,204 INFO task.send-pulses :: Sending scheduled pulses...
Apr 27 17:00:00 prod-metabase-01 metabase[1419]: 2021-04-27 17:00:00,195 INFO task.send-pulses :: Sending scheduled pulses...
Apr 27 18:00:00 prod-metabase-01 metabase[1419]: 2021-04-27 18:00:00,151 INFO task.send-pulses :: Sending scheduled pulses...
Apr 27 19:00:00 prod-metabase-01 metabase[1419]: 2021-04-27 19:00:00,267 INFO task.send-pulses :: Sending scheduled pulses...
Apr 27 20:00:00 prod-metabase-01 metabase[1419]: 2021-04-27 20:00:00,069 INFO task.send-pulses :: Sending scheduled pulses...
Apr 27 20:00:00 prod-metabase-01 metabase[1419]: 2021-04-27 20:00:00,786 INFO task.sync-databases :: Update Field values task triggered for Database 10.
Apr 27 20:00:00 prod-metabase-01 metabase[1419]: 2021-04-27 20:00:00,790 INFO sync.util :: #033[35mSTARTING: Cache field values in bigquery Database 10 'KPI Dashboard - BigQuery'#033[0m
Apr 27 20:00:00 prod-metabase-01 metabase[1419]: 2021-04-27 20:00:00,790 INFO sync.util :: #033[35mSTARTING: step 'update-field-values' for bigquery Database 10 'KPI Dashboard - BigQuery'#033[0m
Apr 27 20:03:57 prod-metabase-01 metabase[1419]: 2021-04-27 20:03:57,980 INFO sync.util :: #033[35mFINISHED: step 'update-field-values' for bigquery Database 10 'KPI Dashboard - BigQuery' (4.0 mins)#033[0m
Apr 27 20:03:58 prod-metabase-01 metabase[1419]: 2021-04-27 20:03:58,222 INFO sync.util :: #033[35mFINISHED: Cache field values in bigquery Database 10 'KPI Dashboard - BigQuery' (4.0 mins)#033[0m
Apr 27 21:00:00 prod-metabase-01 metabase[1419]: 2021-04-27 21:00:00,180 INFO task.send-pulses :: Sending scheduled pulses...
Apr 27 22:00:00 prod-metabase-01 metabase[1419]: 2021-04-27 22:00:00,090 INFO task.send-pulses :: Sending scheduled pulses...
Based on these logs, it looks like after last entry of timestamp Apr 27 10:52:31, it went down as scheduled pulses didn't get any response back. You can clarify it better. If my understanding is correct, then please help me in understanding what happens just before that. I'm sensing some background sync of metabase caused the issue, but you can confirm for that.