To avoid OOM errors like the one reported here, I think we need to introduce a flag for limiting the size of artifacts produced by source-controller (we do have such a flag but only for Helm artifacts).

Proposal (breaking change)

Add a flag --artifact-max-size with the default set to 50MiB (same default as for --helm-index-max-size).

If the max limit is reached, the controller should fail to reconcile the source and error out with a message that invites users to setup spec.ignore and exclude non-Kubernetes files. Depending on the source type we should link to one of the following docs:

• https://fluxcd.io/flux/components/source/gitrepositories/#excluding-files
• https://fluxcd.io/flux/components/source/ocirepositories/#excluding-files
• https://fluxcd.io/flux/components/source/buckets/#excluding-files