MongoDB deployment keeps crashing

I deployed mongodb using the template about 10 days ago and it suddenly starts crashing today. Here is the deployment log. the problem seems to be related to memory usage of mongo? looking at the metrics, the memory usage of my mongodb seems to be increasing graudually over time but still it should be nowhere close the 512MB RAM limit offered by the free plan (my other services do not use more than 150MB memory). So i wonder why mongodb is crashing?

Solution:

you are likely hitting the 0.5gb volume limit, please upgrade to hobby so that you can grow the volume to 5gb

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