When a quota request is rejected, increment the metric counter by one.
Also makes both frontend and backend metrics singleton because all the fields they have a static.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=185146804
The quota handler terminates connections when quota is exceeded.
The next CL will add instrumentation for quota related metrics.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=185042675
The TokenStore is configured by a QuotaConfig for a protocol (EPP/WHOIS). It accepts concurrent take, put and refresh request to grant/accept token to the caller.
The QuotaManager contains a TokenStore and provides abstractions that are appropriate for a quota leasing entity to use. Quota return calls are executed asynchronously by the QuotaManager, and quota refresh tasks are scheduled by the QuotaManager to run periodically.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=182109341
The quotas can be configured in the yaml configuration file. Default quota will be applied to any userId that is not matched in the custom quota list.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=178804649
Dagger updated to 2.13, along with all its dependencies.
Also allows us to have multiple config files for different environment (prod, sandbox, alpha, local, etc) and specify which one to use on the command line with a --env flag. Therefore the same binary can be used in all environments.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=176551289
