CosmosDB make use of [Request Units (RU)](https://docs.microsoft.com/en-us/azure/cosmos-db/request-units) for throughput provisioning. This PR emits the changed RU as a metric which helps in monitoring the resource consumption based on collection and action performed.
## Description Each request made to CosmosDB incurs some change in the form of RU spent for that request processing. This charge info is provided via response header `x-ms-request-charge` ``` x-ms-session-token: 4:3 x-ms-request-charge: 5.24 x-ms-serviceversion: version=2.0.0.0 ``` This PR expose the charge as a metric named `cosmosdb_ru_used`. It also associates some tags like - `mode` - `read` or `write` - `collection` - Name of collection i.e. `activations`, `whisks` and `subjects` - `action` - Type of operation performed. Example `get`, `put` etc If tags are not enabled the metric name is generated like `cosmosdb.ru.<collecton name>.<action>` ## Related issue and scope <!--- Please include a link to a related issue if there is one. --> - [ ] I opened an issue to propose and discuss this change (#????) ## My changes affect the following components <!--- Select below all system components are affected by your change. --> <!--- Enter an `x` in all applicable boxes. --> - [ ] API - [ ] Controller - [ ] Message Bus (e.g., Kafka) - [ ] Loadbalancer - [ ] Invoker - [ ] Intrinsic actions (e.g., sequences, conductors) - [ ] Data stores (e.g., CouchDB) - [ ] Tests - [ ] Deployment - [ ] CLI - [ ] General tooling - [ ] Documentation ## Types of changes <!--- What types of changes does your code introduce? Use `x` in all the boxes that apply: --> - [ ] Bug fix (generally a non-breaking change which closes an issue). - [ ] Enhancement or new feature (adds new functionality). - [ ] Breaking change (a bug fix or enhancement which changes existing behavior). ## Checklist: <!--- Please review the points below which help you make sure you've covered all aspects of the change you're making. --> - [ ] I signed an [Apache CLA](https://github.com/apache/incubator-openwhisk/blob/master/CONTRIBUTING.md). - [ ] I reviewed the [style guides](https://github.com/apache/incubator-openwhisk/wiki/Contributing:-Git-guidelines#code-readiness) and followed the recommendations (Travis CI will check :). - [ ] I added tests to cover my changes. - [ ] My changes require further changes to the documentation. - [ ] I updated the documentation where necessary. [ Full content available at: https://github.com/apache/incubator-openwhisk/pull/4023 ] This message was relayed via gitbox.apache.org for [email protected]
