A lot of noise in the logs - "Connection ended" - "Connection accepted"

I’ve configured the verbosity of our 5 member replica set to level 0, but our log files keep filling with thousands of noisy “connection ended” and “connection accepted” messages. They appear perfectly innocent, but the sheer amount of these logs really makes no sense.

Is it really normal & intentional for MongoDB to log all these near-identical log messages, since apparently there is no recommended method to disable them? Our old production cluster running 3.x doesn’t do this.

Do these log messages indicate a problem in out MongoDB setup?

Example logs
{"t":{"$date":"2022-04-07T09:44:21.765+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55534","uuid":"970ac484-45f4-4bfd-a1cc-4e59d33bbf53","connectionId":1610,"connectionCount":345}}
{"t":{"$date":"2022-04-07T09:44:21.765+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55536","uuid":"b5b6b395-bba8-4b43-bb7d-75e6d5d44b03","connectionId":1611,"connectionCount":346}}
{"t":{"$date":"2022-04-07T09:44:21.775+00:00"},"s":"I",  "c":"NETWORK",  "id":22944,   "ctx":"conn1610","msg":"Connection ended","attr":{"remote":"127.0.0.1:55534","uuid":"970ac484-45f4-4bfd-a1cc-4e59d33bbf53","connectionId":1610,"connectionCount":345}}
{"t":{"$date":"2022-04-07T09:44:21.776+00:00"},"s":"I",  "c":"NETWORK",  "id":22944,   "ctx":"conn1611","msg":"Connection ended","attr":{"remote":"127.0.0.1:55536","uuid":"b5b6b395-bba8-4b43-bb7d-75e6d5d44b03","connectionId":1611,"connectionCount":344}}
{"t":{"$date":"2022-04-07T09:44:22.265+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55540","uuid":"837b55aa-4989-492e-93c4-f2945f33dd88","connectionId":1612,"connectionCount":345}}
{"t":{"$date":"2022-04-07T09:44:22.275+00:00"},"s":"I",  "c":"NETWORK",  "id":22944,   "ctx":"conn1612","msg":"Connection ended","attr":{"remote":"127.0.0.1:55540","uuid":"837b55aa-4989-492e-93c4-f2945f33dd88","connectionId":1612,"connectionCount":344}}
{"t":{"$date":"2022-04-07T09:44:22.766+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55542","uuid":"ed0c5ad6-4e7f-4a4a-a892-7084a1c3b8b2","connectionId":1613,"connectionCount":345}}
{"t":{"$date":"2022-04-07T09:44:22.776+00:00"},"s":"I",  "c":"NETWORK",  "id":22944,   "ctx":"conn1613","msg":"Connection ended","attr":{"remote":"127.0.0.1:55542","uuid":"ed0c5ad6-4e7f-4a4a-a892-7084a1c3b8b2","connectionId":1613,"connectionCount":344}}
{"t":{"$date":"2022-04-07T09:44:23.265+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55544","uuid":"e55da0f7-de29-4f79-9bbe-616606642263","connectionId":1614,"connectionCount":345}}
{"t":{"$date":"2022-04-07T09:44:23.276+00:00"},"s":"I",  "c":"NETWORK",  "id":22944,   "ctx":"conn1614","msg":"Connection ended","attr":{"remote":"127.0.0.1:55544","uuid":"e55da0f7-de29-4f79-9bbe-616606642263","connectionId":1614,"connectionCount":344}}
{"t":{"$date":"2022-04-07T09:44:23.766+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55546","uuid":"2c4eff77-feb9-4291-a2b9-f8af4fd638f7","connectionId":1615,"connectionCount":345}}
{"t":{"$date":"2022-04-07T09:44:23.776+00:00"},"s":"I",  "c":"NETWORK",  "id":22944,   "ctx":"conn1615","msg":"Connection ended","attr":{"remote":"127.0.0.1:55546","uuid":"2c4eff77-feb9-4291-a2b9-f8af4fd638f7","connectionId":1615,"connectionCount":344}}
{"t":{"$date":"2022-04-07T09:44:24.265+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55548","uuid":"d200a42f-f191-4d70-a31e-b675d0ee9741","connectionId":1616,"connectionCount":345}}
{"t":{"$date":"2022-04-07T09:44:24.275+00:00"},"s":"I",  "c":"NETWORK",  "id":22944,   "ctx":"conn1616","msg":"Connection ended","attr":{"remote":"127.0.0.1:55548","uuid":"d200a42f-f191-4d70-a31e-b675d0ee9741","connectionId":1616,"connectionCount":344}}
{"t":{"$date":"2022-04-07T09:44:36.766+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55550","uuid":"bb55f2a2-eb52-4480-bd83-f60c1b4945b6","connectionId":1617,"connectionCount":345}}
{"t":{"$date":"2022-04-07T09:44:36.766+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55552","uuid":"a9e7f258-6262-4289-8357-945599d225f2","connectionId":1618,"connectionCount":346}}
{"t":{"$date":"2022-04-07T09:44:36.781+00:00"},"s":"I",  "c":"NETWORK",  "id":22944,   "ctx":"conn1617","msg":"Connection ended","attr":{"remote":"127.0.0.1:55550","uuid":"bb55f2a2-eb52-4480-bd83-f60c1b4945b6","connectionId":1617,"connectionCount":345}}
{"t":{"$date":"2022-04-07T09:44:36.781+00:00"},"s":"I",  "c":"NETWORK",  "id":22944,   "ctx":"conn1618","msg":"Connection ended","attr":{"remote":"127.0.0.1:55552","uuid":"a9e7f258-6262-4289-8357-945599d225f2","connectionId":1618,"connectionCount":344}}
{"t":{"$date":"2022-04-07T09:44:37.266+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55554","uuid":"367f2901-cca2-4aca-9465-9cfb2bbf6785","connectionId":1619,"connectionCount":345}}
{"t":{"$date":"2022-04-07T09:44:37.275+00:00"},"s":"I",  "c":"NETWORK",  "id":22944,   "ctx":"conn1619","msg":"Connection ended","attr":{"remote":"127.0.0.1:55554","uuid":"367f2901-cca2-4aca-9465-9cfb2bbf6785","connectionId":1619,"connectionCount":344}}
{"t":{"$date":"2022-04-07T09:44:37.766+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55556","uuid":"3dc4b466-5064-4e58-bab3-8ad00a2c878a","connectionId":1620,"connectionCount":345}}
{"t":{"$date":"2022-04-07T09:44:37.777+00:00"},"s":"I",  "c":"NETWORK",  "id":22944,   "ctx":"conn1620","msg":"Connection ended","attr":{"remote":"127.0.0.1:55556","uuid":"3dc4b466-5064-4e58-bab3-8ad00a2c878a","connectionId":1620,"connectionCount":344}}
{"t":{"$date":"2022-04-07T09:44:38.266+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55558","uuid":"23a5d6eb-7c9b-4979-81a2-982969a8e5a5","connectionId":1621,"connectionCount":345}}
{"t":{"$date":"2022-04-07T09:44:38.277+00:00"},"s":"I",  "c":"NETWORK",  "id":22944,   "ctx":"conn1621","msg":"Connection ended","attr":{"remote":"127.0.0.1:55558","uuid":"23a5d6eb-7c9b-4979-81a2-982969a8e5a5","connectionId":1621,"connectionCount":344}}
{"t":{"$date":"2022-04-07T09:44:38.767+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55560","uuid":"6fbf7f97-919f-4963-a43b-20a3f1f107e3","connectionId":1622,"connectionCount":345}}
{"t":{"$date":"2022-04-07T09:44:38.777+00:00"},"s":"I",  "c":"NETWORK",  "id":22944,   "ctx":"conn1622","msg":"Connection ended","attr":{"remote":"127.0.0.1:55560","uuid":"6fbf7f97-919f-4963-a43b-20a3f1f107e3","connectionId":1622,"connectionCount":344}}
{"t":{"$date":"2022-04-07T09:44:39.266+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55562","uuid":"2916a03e-b693-43a9-93e3-735ced3d5088","connectionId":1623,"connectionCount":345}}
{"t":{"$date":"2022-04-07T09:44:39.276+00:00"},"s":"I",  "c":"NETWORK",  "id":22944,   "ctx":"conn1623","msg":"Connection ended","attr":{"remote":"127.0.0.1:55562","uuid":"2916a03e-b693-43a9-93e3-735ced3d5088","connectionId":1623,"connectionCount":344}}
{"t":{"$date":"2022-04-07T09:44:51.766+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55564","uuid":"09ae77fc-0d26-44d9-ba17-7ee698decd67","connectionId":1624,"connectionCount":345}}
{"t":{"$date":"2022-04-07T09:44:51.767+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55566","uuid":"44222b4d-2a1c-4bb1-a3e7-73c7f66e22af","connectionId":1625,"connectionCount":346}}
{"t":{"$date":"2022-04-07T09:44:51.777+00:00"},"s":"I",  "c":"NETWORK",  "id":22944,   "ctx":"conn1625","msg":"Connection ended","attr":{"remote":"127.0.0.1:55566","uuid":"44222b4d-2a1c-4bb1-a3e7-73c7f66e22af","connectionId":1625,"connectionCount":345}}
{"t":{"$date":"2022-04-07T09:44:51.777+00:00"},"s":"I",  "c":"NETWORK",  "id":22944,   "ctx":"conn1624","msg":"Connection ended","attr":{"remote":"127.0.0.1:55564","uuid":"09ae77fc-0d26-44d9-ba17-7ee698decd67","connectionId":1624,"connectionCount":344}}
{"t":{"$date":"2022-04-07T09:44:52.267+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55568","uuid":"5ce2a50e-d8e6-4667-aa5b-bd344958b91a","connectionId":1626,"connectionCount":345}}
{"t":{"$date":"2022-04-07T09:44:52.277+00:00"},"s":"I",  "c":"NETWORK",  "id":22944,   "ctx":"conn1626","msg":"Connection ended","attr":{"remote":"127.0.0.1:55568","uuid":"5ce2a50e-d8e6-4667-aa5b-bd344958b91a","connectionId":1626,"connectionCount":344}}
{"t":{"$date":"2022-04-07T09:44:52.766+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55570","uuid":"4cd60f8b-296e-4f09-b7e3-14967b78c40c","connectionId":1627,"connectionCount":345}}
{"t":{"$date":"2022-04-07T09:44:52.778+00:00"},"s":"I",  "c":"NETWORK",  "id":22944,   "ctx":"conn1627","msg":"Connection ended","attr":{"remote":"127.0.0.1:55570","uuid":"4cd60f8b-296e-4f09-b7e3-14967b78c40c","connectionId":1627,"connectionCount":344}}
{"t":{"$date":"2022-04-07T09:44:53.267+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55572","uuid":"29606858-4902-4288-a7b1-b753f28271e4","connectionId":1628,"connectionCount":345}}
{"t":{"$date":"2022-04-07T09:44:53.277+00:00"},"s":"I",  "c":"NETWORK",  "id":22944,   "ctx":"conn1628","msg":"Connection ended","attr":{"remote":"127.0.0.1:55572","uuid":"29606858-4902-4288-a7b1-b753f28271e4","connectionId":1628,"connectionCount":344}}
{"t":{"$date":"2022-04-07T09:44:53.767+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55574","uuid":"caed7d75-c257-4779-83c8-6f1b58aab4d5","connectionId":1629,"connectionCount":345}}
{"t":{"$date":"2022-04-07T09:44:53.777+00:00"},"s":"I",  "c":"NETWORK",  "id":22944,   "ctx":"conn1629","msg":"Connection ended","attr":{"remote":"127.0.0.1:55574","uuid":"caed7d75-c257-4779-83c8-6f1b58aab4d5","connectionId":1629,"connectionCount":344}}
{"t":{"$date":"2022-04-07T09:44:54.267+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55576","uuid":"c2c61cdf-6d5b-4f15-b051-cc29026fb022","connectionId":1630,"connectionCount":345}}
{"t":{"$date":"2022-04-07T09:44:54.276+00:00"},"s":"I",  "c":"NETWORK",  "id":22944,   "ctx":"conn1630","msg":"Connection ended","attr":{"remote":"127.0.0.1:55576","uuid":"c2c61cdf-6d5b-4f15-b051-cc29026fb022","connectionId":1630,"connectionCount":344}}
{"t":{"$date":"2022-04-07T09:45:06.766+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55578","uuid":"0c877b90-1cc6-4b18-9e27-01cc8821d57c","connectionId":1631,"connectionCount":345}}
{"t":{"$date":"2022-04-07T09:45:06.766+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55580","uuid":"88a12d48-86ce-4b9c-bb5c-9c3a77b3f4e9","connectionId":1632,"connectionCount":346}}
{"t":{"$date":"2022-04-07T09:45:06.776+00:00"},"s":"I",  "c":"NETWORK",  "id":22944,   "ctx":"conn1631","msg":"Connection ended","attr":{"remote":"127.0.0.1:55578","uuid":"0c877b90-1cc6-4b18-9e27-01cc8821d57c","connectionId":1631,"connectionCount":345}}
{"t":{"$date":"2022-04-07T09:45:06.778+00:00"},"s":"I",  "c":"NETWORK",  "id":22944,   "ctx":"conn1632","msg":"Connection ended","attr":{"remote":"127.0.0.1:55580","uuid":"88a12d48-86ce-4b9c-bb5c-9c3a77b3f4e9","connectionId":1632,"connectionCount":344}}
{"t":{"$date":"2022-04-07T09:45:07.266+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55582","uuid":"968c2f0e-5ef8-4967-ab71-a017a165c40d","connectionId":1633,"connectionCount":345}}
{"t":{"$date":"2022-04-07T09:45:07.277+00:00"},"s":"I",  "c":"NETWORK",  "id":22944,   "ctx":"conn1633","msg":"Connection ended","attr":{"remote":"127.0.0.1:55582","uuid":"968c2f0e-5ef8-4967-ab71-a017a165c40d","connectionId":1633,"connectionCount":344}}
{"t":{"$date":"2022-04-07T09:45:07.766+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55584","uuid":"ab47954c-d4c4-487d-a554-309d7bb07f75","connectionId":1634,"connectionCount":345}}
{"t":{"$date":"2022-04-07T09:45:07.776+00:00"},"s":"I",  "c":"NETWORK",  "id":22944,   "ctx":"conn1634","msg":"Connection ended","attr":{"remote":"127.0.0.1:55584","uuid":"ab47954c-d4c4-487d-a554-309d7bb07f75","connectionId":1634,"connectionCount":344}}
{"t":{"$date":"2022-04-07T09:45:08.266+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55586","uuid":"e7b5a901-87d1-4409-9b17-b41dec3ef079","connectionId":1635,"connectionCount":345}}
{"t":{"$date":"2022-04-07T09:45:08.275+00:00"},"s":"I",  "c":"NETWORK",  "id":22944,   "ctx":"conn1635","msg":"Connection ended","attr":{"remote":"127.0.0.1:55586","uuid":"e7b5a901-87d1-4409-9b17-b41dec3ef079","connectionId":1635,"connectionCount":344}}
{"t":{"$date":"2022-04-07T09:45:08.766+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55588","uuid":"a7eb3eb3-67ec-4f44-9540-56c1e4c8a8f6","connectionId":1636,"connectionCount":345}}
{"t":{"$date":"2022-04-07T09:45:08.777+00:00"},"s":"I",  "c":"NETWORK",  "id":22944,   "ctx":"conn1636","msg":"Connection ended","attr":{"remote":"127.0.0.1:55588","uuid":"a7eb3eb3-67ec-4f44-9540-56c1e4c8a8f6","connectionId":1636,"connectionCount":344}}
{"t":{"$date":"2022-04-07T09:45:09.266+00:00"},"s":"I",  "c":"NETWORK",  "id":22943,   "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:55590","uuid":"853d1b22-de94-4488-9e34-58eae3d3ccce","connectionId":1637,"connectionCount":345}}

Forgot to mention, we’re running MongoDB 5.0.6.

Check your verbosity level from db.getLoglevel…Are they at default value or higher
You can set verbosity at component levels like query,storage,network etc

You cannot eliminate those messages.You need it for debugging
Some suggest start mongod with quiet option but not recommended for prod

Verbosity is set to 0, with all the components set to -1 (inherit, as I understood).

I am having the same issue. Log files grow huge with Connection ended, Connection accepted messages. Running MongoDB 5.0.7 and logLevel is set to 0. I know I can rotate/delete logs, but wow this seems highly unnecessary and a risk of blowing up free space.