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To clarify again, I'm not the one starting it - Unifi ships its network appliance as a debian package that depends on mongod and starts it up itself (and it's absolutely a single node configuration). Maybe you guys should have a talk with them :)

This is what monogd.log contains when started:

    2020-09-24T21:18:54.231-0500 I CONTROL  [initandlisten] MongoDB starting : pid=7531 port=27117 dbpath=/usr/lib/unifi/data/db 64-bit host=unifi
    2020-09-24T21:18:54.231-0500 I CONTROL  [initandlisten] db version v3.6.20
    2020-09-24T21:18:54.231-0500 I CONTROL  [initandlisten] git version: 39c200878284912f19553901a6fea4b31531a899
    2020-09-24T21:18:54.231-0500 I CONTROL  [initandlisten] OpenSSL version: OpenSSL 1.1.1d  10 Sep 2019
    2020-09-24T21:18:54.231-0500 I CONTROL  [initandlisten] allocator: tcmalloc
    2020-09-24T21:18:54.231-0500 I CONTROL  [initandlisten] modules: none
    2020-09-24T21:18:54.231-0500 I CONTROL  [initandlisten] build environment:
    2020-09-24T21:18:54.231-0500 I CONTROL  [initandlisten]     distmod: debian92
    2020-09-24T21:18:54.231-0500 I CONTROL  [initandlisten]     distarch: x86_64
    2020-09-24T21:18:54.231-0500 I CONTROL  [initandlisten]     target_arch: x86_64
    2020-09-24T21:18:54.231-0500 I CONTROL  [initandlisten] options: { net: { bindIp: "127.0.0.1", port: 27117, unixDomainSocket: { pathPrefix: "/usr/lib/unifi/run" } }, processManagement: { pidFilePath: "/usr/lib/unifi/run/mongod.pid" }, storage: { dbPath: "/usr/lib/unifi/data/db" }, systemLog: { destination: "file", logAppend: true, logRotate: "reopen", path: "/usr/lib/unifi/logs/mongod.log" } }
    2020-09-24T21:18:54.231-0500 I STORAGE  [initandlisten] wiredtiger_open config: create,cache_size=256M,cache_overflow=(file_max=0M),session_max=20000,eviction=(threads_min=4,threads_max=4),config_base=false,statistics=(fast),compatibility=(release="3.0",require_max="3.0"),log=(enabled=true,archive=true,path=journal,compressor=snappy),file_manager=(close_idle_time=100000),statistics_log=(wait=0),verbose=(recovery_progress),

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021-12-07T19:05:23.822-0600 I CONTROL [initandlisten] options: { net: { bindIp: "127.0.0.1", port: 27117, unixDomainSocket: { pathPrefix: "/usr/lib/unifi/run" } }, processManagement: { pidFilePath: "/usr/lib/unifi/run/mongod.pid" }, storage: { dbPath: "/usr/lib/unifi/data/db", wiredTiger: { engineConfig: { configString: "cache_size=256M" } } }, systemLog: { destination: "file", logAppend: true, logRotate: "reopen", path: "/usr/lib/unifi/logs/mongod.log" } } 2021-12-07T19:05:23.822-0600 I - [initandlisten] Detected data files in /usr/lib/unifi/data/db created by the 'wiredTiger' storage engine, so setting the active storage engine to 'wiredTiger'. 2021-12-07T19:05:23.822-0600 I STORAGE [initandlisten] wiredtiger_open config: create,cache_size=256M,cache_overflow=(file_max=0M),session_max=20000,eviction=(threads_min=4,threads_max=4),config_base=false,statistics=(fast),compatibility=(release="3.0",require_max="3.0"),log=(enabled=true,archive=true,path=journal,compressor=snappy),file_manager=(close_idle_time=100000),statistics_log=(wait=0),verbose=(recovery_progress),cache_size=256M 2021-12-07T19:05:24.339-0600 E STORAGE [initandlisten] WiredTiger error (-31802) [1638925524:339440][1327:0x7f952058b400], file:WiredTiger.wt, connection: __wt_btree_tree_open, 604: unable to read root page from file:WiredTiger.wt: WT_ERROR: non-specific WiredTiger error Raw: [1638925524:339440][1327:0x7f952058b400], file:WiredTiger.wt, connection: __wt_btree_tree_open, 604: unable to read root page from file:WiredTiger.wt: WT_ERROR: non-specific WiredTiger error 2021-12-07T19:05:24.339-0600 E STORAGE [initandlisten] WiredTiger error (0) [1638925524:339475][1327:0x7f952058b400], file:WiredTiger.wt, connection: __wt_btree_tree_open, 611: WiredTiger has failed to open its metadata Raw: [1638925524:339475][1327:0x7f952058b400], file:WiredTiger.wt, connection: __wt_btree_tree_open, 611: WiredTiger has failed to open its metadata 2021-12-07T19:05:24.339-0600 E STORAGE [initandlisten] WiredTiger error (0) [1638925524:339483][1327:0x7f952058b400], file:WiredTiger.wt, connection: __wt_btree_tree_open, 614: This may be due to the database files being encrypted, being from an older version or due to corruption on disk Raw: [1638925524:339483][1327:0x7f952058b400], file:WiredTiger.wt, connection: __wt_btree_tree_open, 614: This may be due to the database files being encrypted, being from an older version or due to corruption on disk 2021-12-07T19:05:24.339-0600 E STORAGE [initandlisten] WiredTiger error (0) [1638925524:339489][1327:0x7f952058b400], file:WiredTiger.wt, connection: __wt_btree_tree_open, 617: You should confirm that you have opened the database with the correct options including all encryption and compression options Raw: [1638925524:339489][1327:0x7f952058b400], file:WiredTiger.wt, connection: __wt_btree_tree_open, 617: You should confirm that you have opened the database with the correct options including all encryption and compression options 2021-12-07T19:05:24.340-0600 F STORAGE [initandlisten] WiredTiger metadata corruption detected 2021-12-07T19:05:24.340-0600 F STORAGE [initandlisten] This version of MongoDB is unable to repair this kind of corruption, but version 4.0.3+ may be able to repair it. See http://dochub.mongodb.org/core/repair for more information. 2021-12-07T19:05:24.340-0600 F - [initandlisten] Fatal Assertion 50944 at src/mongo/db/storage/wiredtiger/wiredtiger_util.cpp 71 2021-12-07T19:05:24.340-0600 F - [initandlisten] \n\n***aborting after fassert() failure\n\n