Checkpoint: Resilient Fetch Pipeline
Challenge on lesson: Checkpoint โ The Parallel Fetcher
CHALLENGE
Difficulty: intermediate+25 XP
Implement the pipeline described in the checkpoint:
``csharp
static Task<List<string>> FetchAll(IEnumerable<string> keys, TimeSpan perCall, CancellationToken ct);
static string Report(List<string> results); // "a=ok|b=timeout" sorted by key
``
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