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Pretty new to both gcp and pulumi (coming from an aws/serverless framework background fwiw).

It looks like the `HttpCallbackFunction` is meant to serve as an abstraction over the regular `gcp.cloudfunctions.Function` resource. Am I correct in assuming that only the latter allows for customization of the node runtime, available memory, etc.?

The memory is configurable with `availableMemoryMb`. The runtime is fixed to node js because that's what you write your callback for.

i’m not seeing any option for setting memory in `HttpCallbackFunction`, just regular function. by runtime i mean node 10 vs 8

<https://github.com/pulumi/pulumi-gcp/blob/a7cda444e2b0889d2f8f4eab5df1226419093efa/sdk/nodejs/cloudfunctions/zMixins.ts#L283>

```new gcp.cloudfunctions.HttpCallbackFunction("f", {
    availableMemoryMb: 128,
    callback: work,
});```

Good point about the runtime. I'd appreciate if you could file an issue.