Enable usage logs to track the downloads for artifacts in knative-releases project

[chizhg]

Currently, the network egress cost for knative-releases project is ~$1k per month, and it's because this project hosts all the Knative release artifacts in GCS and GCR, and all the Knative users will download them from it.

As there are more and more Knative users, the cost for it will keep growing. To get a better understanding on where the costs come from and also for potential future improvements, it'll better track the usage for the Knative releases. Usage logs is the recommended solution to do this - https://cloud.google.com/storage/docs/access-logs

/cc @upodroid

[chizhg]

Enabled by running below commands:

$ gsutil mb gs://knative-releases-analysis -p knative-releases
$ gsutil iam ch group:cloud-storage-analytics@google.com:legacyBucketWriter gs://knative-releases-analysis
$ gsutil logging set on -b gs://knative-releases-analysis gs://knative-releases gs://artifacts.knative-releases.appspot.com gs://asia.artifacts.knative-releases.appspot.com gs://eu.artifacts.knative-releases.appspot.com gs://us.artifacts.knative-releases.appspot.com

[chizhg]

Next steps will be finishing Analyze logs in BigQuery and probably writing a tool to aggregate the data to see what are the main sources for these requests, but I don't have bandwidth to work on it now.

I have run gsutil logging set off gs://knative-releases-analysis gs://knative-releases gs://artifacts.knative-releases.appspot.com gs://asia.artifacts.knative-releases.appspot.com gs://eu.artifacts.knative-releases.appspot.com gs://us.artifacts.knative-releases.appspot.com to disable the usage logs for now. If anyone is interested in this work, please feel free to pick it up and continue.

/cc @kvmware

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