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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
There is nothing wrong with System.Linq just like there's nothing wrong with Rust's std::iter::Iterator. If anything, this makes writing Rust very familiar if you have C# experience and vice versa.
The performance profile of LINQ, while much maligned, has been steadily improving over the years and, in the example of Sum itself, you actually do want to use it because it will sum faster than open-coded loop[0].
I do have grievances regarding LINQ still - my (non-negotiable) standpoint is that Roslyn (C# compiler) must lower non-escaping LINQ operations to open-coded loops, inline lambdas at IL level and similar, making it zero-cost - .NET (IL compiler/runtime) provides all the tools necessary to match what Rust's zero-cost-ish iterator expressions offer and there just needs to be more political will in the Roslyn teams to do so. Because of this, I'm holding my breath waiting for DistIL[1] to be production-ready which does just that.
[0]: https://github.com/dotnet/runtime/blob/main/src/libraries/Sy...
[1]: https://github.com/dubiousconst282/DistIL