How to solve Out of memory: Killed process?

The app is nodejs
Here is the logs:

--> You can detach the terminal anytime without stopping the deployment
==> Monitoring deployment

 1 desired, 1 placed, 0 healthy, 1 unhealthy [restarts: 2] [health checks: 1 total, 1 critical]
Failed Instances

Failure #1

Instance
ID              PROCESS VERSION REGION  DESIRED STATUS  HEALTH CHECKS           RESTARTS        CREATED   
56bc4238                8       sin     run     running 1 total, 1 critical     2               2m40s ago

Recent Events
TIMESTAMP               TYPE            MESSAGE                         
2022-06-22T00:11:39Z    Received        Task received by client        
2022-06-22T00:11:39Z    Task Setup      Building Task Directory        
2022-06-22T00:12:12Z    Started         Task started by client         
2022-06-22T00:12:48Z    Terminated      Exit Code: 137                 
2022-06-22T00:12:48Z    Restarting      Task restarting in 1.000105063s
2022-06-22T00:12:57Z    Started         Task started by client         
2022-06-22T00:13:29Z    Terminated      Exit Code: 137                 
2022-06-22T00:13:29Z    Restarting      Task restarting in 1.048454252s
2022-06-22T00:13:37Z    Started         Task started by client         

2022-06-22T00:12:58Z   [info]default Mixed
2022-06-22T00:13:26Z   [info][   29.563498] Out of memory: Killed process 535 (node) total-vm:898936kB, anon-rss:180116kB, file-rss:0kB, shmem-rss:0kB, UID:1000 pgtables:2296kB oom_score_adj:0
2022-06-22T00:13:26Z   [info]Killed
2022-06-22T00:13:26Z   [info]npm ERR! code ELIFECYCLE
2022-06-22T00:13:26Z   [info]npm ERR! errno 137
2022-06-22T00:13:26Z   [info]npm ERR! xxx@0.0.0 start: `node ./bin/www`
2022-06-22T00:13:26Z   [info]npm ERR! Exit status 137
2022-06-22T00:13:26Z   [info]npm ERR!
2022-06-22T00:13:26Z   [info]npm ERR! Failed at the xxx@0.0.0 start script.
2022-06-22T00:13:26Z   [info]npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
2022-06-22T00:13:26Z   [info]npm ERR! A complete log of this run can be found in:
2022-06-22T00:13:26Z   [info]npm ERR!     /app/.npm/_logs/2022-06-22T00_13_26_590Z-debug.log
2022-06-22T00:13:27Z   [info]Main child exited normally with code: 137

My app is not big enough


It solved by scale up the VM
But I’m not sure, how the shared cpu works, and which apps under our shared cpu