Also looking at the graphite logs:

Mar 12 23:07:05 12/03/2021 22:07:05 :: [tagdb] Error tagging collectd.localhost.table-0e95e7bb-2ffb-4b5c-af67-64484fe51e33-memory.gauge-cache: Error requesting http://127.0.0.1:80/tags/tagMultiSeries: HTTPConnectionPool(host='127.0.0.1', port=80): Max retries exceeded with url: /tags/tagMultiSeries (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7fdc0f856af0>: Failed to establish a new connection: [Errno 111] Connection refused'))
Mar 12 23:07:26 12/03/2021 22:07:26 :: [tagdb] Tagging collectd.localhost.table-e1ca318a-a940-477b-bb4f-43722b127b92-memory.gauge-hierarchical_memory_limit, collectd.localhost.table-d03dd73e-4045-42f7-8e6d-7b6e36b2caba-memory.gauge-total_active_file, collectd.localhost.table-9cea909a-e860-4a20-8d38-bd7820088c93-memory.gauge-inactive_anon, collectd.localhost.table-4d6310dd-104d-4eae-bdd2-025ad353bc45-memory.gauge-total_pgmajfault, collectd.localhost.table-42c605b3-e603-43a2-bfa7-f24fc238c899-memory.gauge-pgpgin, collectd.localhost.table-33db8df1-0687-4415-b5a2-d1ffc5a1339c-memory.gauge-total_swap
Mar 12 23:07:26 12/03/2021 22:07:26 :: [tagdb] Error tagging collectd.localhost.table-e1ca318a-a940-477b-bb4f-43722b127b92-memory.gauge-hierarchical_memory_limit, collectd.localhost.table-d03dd73e-4045-42f7-8e6d-7b6e36b2caba-memory.gauge-total_active_file, collectd.localhost.table-9cea909a-e860-4a20-8d38-bd7820088c93-memory.gauge-inactive_anon, collectd.localhost.table-4d6310dd-104d-4eae-bdd2-025ad353bc45-memory.gauge-total_pgmajfault, collectd.localhost.table-42c605b3-e603-43a2-bfa7-f24fc238c899-memory.gauge-pgpgin, collectd.localhost.table-33db8df1-0687-4415-b5a2-d1ffc5a1339c-memory.gauge-total_swap: Error requesting http://127.0.0.1:80/tags/tagMultiSeries: HTTPConnectionPool(host='127.0.0.1', port=80): Max retries exceeded with url: /tags/tagMultiSeries (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7fdc0e772700>: Failed to establish a new connection: [Errno 111] Connection refused'))
Mar 12 23:07:26 12/03/2021 22:07:26 :: [tagdb] Tagging collectd.localhost.table-0ea62e64-2569-4095-942e-81f50c4c93a3-memory.gauge-shmem
Mar 12 23:07:26 12/03/2021 22:07:26 :: [tagdb] Error tagging collectd.localhost.table-0ea62e64-2569-4095-942e-81f50c4c93a3-memory.gauge-shmem: Error requesting http://127.0.0.1:80/tags/tagMultiSeries: HTTPConnectionPool(host='127.0.0.1', port=80): Max retries exceeded with url: /tags/tagMultiSeries (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7fdc0e7b18e0>: Failed to establish a new connection: [Errno 111] Connection refused'))
Mar 12 23:07:26 12/03/2021 22:07:26 :: [tagdb] Tagging collectd.localhost.aggregation-cpu-max.cpu-system
Mar 12 23:07:26 12/03/2021 22:07:26 :: [tagdb] Error tagging collectd.localhost.aggregation-cpu-max.cpu-system: Error requesting http://127.0.0.1:80/tags/tagMultiSeries: HTTPConnectionPool(host='127.0.0.1', port=80): Max retries exceeded with url: /tags/tagMultiSeries (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7fdc0e789b20>: Failed to establish a new connection: [Errno 111] Connection refused'))

and redis gets oom:

Mar 12 22:54:34 2021-03-12 21:54:34,993 INFO exited: redis (terminated by SIGKILL; not expected)
Mar 12 22:54:35 2021-03-12 21:54:35,003 INFO spawned: 'redis' with pid 577
Mar 12 22:54:35 2021-03-12 21:54:35,003 INFO reaped unknown pid 576
Mar 12 22:54:35 577:C 12 Mar 2021 21:54:35.037 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
Mar 12 22:54:35 577:C 12 Mar 2021 21:54:35.037 # Redis version=5.0.7, bits=64, commit=00000000, modified=0, pid=577, just started
Mar 12 22:54:35 577:C 12 Mar 2021 21:54:35.037 # Configuration loaded
Mar 12 22:54:35 577:M 12 Mar 2021 21:54:35.039 * Running mode=standalone, port=6379.
Mar 12 22:54:35 577:M 12 Mar 2021 21:54:35.040 # Server initialized
Mar 12 22:54:35 577:M 12 Mar 2021 21:54:35.040 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
Mar 12 22:54:35 577:M 12 Mar 2021 21:54:35.611 * DB loaded from disk: 0.571 seconds

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