https://cloud.google.com/storage/docs/access-control/signing-urls-with-helpers#code-samples
I'm issuing signed url by using getSignedUrl (node).
Is there an upper limit on the number of issuances for getSignedUrl?
Specifically, I want to publish about 7,000 times per hour.
When you use the SignedUrl with the client library, and according with how you use it, you can
Invoque the service account API signBlob method. You have a limit to 60000 blob signatures per minutes. It's not signature method
Sign locally the url with the private key contains in a service account key file (it's the case of your code sample). Because the signature is local (no API invocation), you have no limit on this method.
Sign against the metadata server (it's also the case of your code when deployed on a Google Cloud service, such as, Cloud Function, Compute Engine (and derived: GKE, Dataflow, Dataproc), Cloud Run, App Engine,...). Here again, no limit/quotas documented for the metadata server, but the signature is performed with the Service Account API signBlob method, and the limit of 60000 blob signatures per minutes is enforced.
So, for your use case, you won't be annoyed with the limits on the number of SignUrl that you can perform over 1H
