Graphguy
https://redmonk.com/rstephens/2021/12/17/iaas-pricing-2021/ Is also great and shows a flatness in price
"Amazon DocumentDB implements the Apache 2.0 open source MongoDB 3.6 and 4.0 APIs by emulating the responses that a MongoDB client expects from a MongoDB server, allowing you to use your existing MongoDB drivers and tools with Amazon DocumentDB."
https://aws.amazon.com/documentdb/
IANAL
So many customers don't account for this and it up costing $$$ if your data model isn't a good fit. Cosmos even takes it further w. 1kb units (I have spent hours on Cosmos pricing and am still baffled on how to price a workload.) Although... it does incentivize decent data modeling practices which often lead to more performant apps.
Cassandra Deep Dive with Jonathan Ellis
IBM Acquires Instana
Also, Howard joined in May (which is an important one...because this press release is about Cloud not about HR/patents.)
IBM plans to spin off infrastructure services as a separate $19B business
KubeSat: An autonomous framework for satellite constellations and swarms
Cloudant (API Compatible with CouchDB) has a number of case studies you can reference for production success with the Couch API/ecosystem.
Cabify - https://www.ibm.com/case-studies/cabify-cloudant
Ticket Fairy - https://www.ibm.com/case-studies/the-ticket-fairy-cloud-clou...
We.Trade - https://www.ibm.com/case-studies/wetrade-blockchain-fintech-...
Disclaimer: I work for IBM Cloud