Skip this article and read the more detailed replacement above titled Cosmos DB Request Unit Logging.
This is another reminder to myself, but others may find it useful. You can add a custom handler to the CosmosClient to catch performance information and other statistics in the request headers, then save them for reporting. The technique is identical to adding a chain of handlers to the HttpClient class. You catch important information at a single function point and keep your code clean.
Construct a CosmosClientBuilder class with the endpoint and key to the Cosmos account. Use AddCustomHandlers to add an instance of a class derived from RequestHandler.
The derived class will override SendAsync, await the response and extract important information from the headers. Here is a dump of some GetItemAsync request headers from LINQPad.
Use a callback from the handler or some similar technique to extract the interesting values.
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