refactor!: rename the project from Monitor to MoShiro [CI]

Namespaces, assemblies, solution, binaries, images, systemd units, config paths, environment variables, protocol methods and the Linux user are all renamed. Breaking: existing databases, node identities and installed units must be recreated.

backend/src/MoShiro.Backend.Application/Query/MetricSelection.cs

@@ -0,0 +1,91 @@
+using Fleet.Core;
+using MoShiro.Backend.Analysis;
+using MoShiro.Protocol;
+
+namespace MoShiro.Backend.Application;
+
+/// <summary>请求的指标：导出 id（<c>rtt.p95</c>）与评分 id（<c>score.mc</c>）。</summary>
+public sealed record MetricSelection(IReadOnlyList<string> ExportIds, IReadOnlyList<string> ScoreModelIds)
+{
+    public bool WantsScores => ScoreModelIds.Count > 0;
+
+    public IEnumerable<string> AllIds => ExportIds.Concat(ScoreModelIds.Select(m => "score." + m));
+
+    public static Result<MetricSelection> Resolve(string? metrics, string? presets, int maxMetrics)
+    {
+        var ids = new List<string>();
+        if (presets is not null)
+        {
+            foreach (string presetId in presets.Split(',', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries))
+            {
+                PresetDef? preset = MetricRegistry.FindPreset(presetId);
+                if (preset is null)
+                {
+                    return Result<MetricSelection>.Fail(MoShiroErrors.UnknownPreset, $"unknown preset {presetId}");
+                }
+
+                ids.AddRange(preset.MetricIds);
+            }
+        }
+
+        if (metrics is not null)
+        {
+            ids.AddRange(metrics.Split(',', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries));
+        }
+
+        ids = [.. ids.Distinct(StringComparer.Ordinal)];
+        if (ids.Count > maxMetrics)
+        {
+            return Result<MetricSelection>.Fail(MoShiroErrors.TooManyMetrics, $"at most {maxMetrics} metrics per request");
+        }
+
+        var exports = new List<string>();
+        var scores = new List<string>();
+        foreach (string id in ids)
+        {
+            if (id.StartsWith("score.", StringComparison.Ordinal))
+            {
+                string model = id["score.".Length..];
+                if (ModelRegistry.Find(model) is null)
+                {
+                    return Result<MetricSelection>.Fail(MoShiroErrors.UnknownMetric, $"unknown metric {id}");
+                }
+
+                scores.Add(model);
+            }
+            else if (MetricRegistry.TryFindExport(id, out _, out _))
+            {
+                exports.Add(id);
+            }
+            else
+            {
+                return Result<MetricSelection>.Fail(MoShiroErrors.UnknownMetric, $"unknown metric {id}");
+            }
+        }
+
+        return Result<MetricSelection>.Ok(new MetricSelection(exports, scores));
+    }
+}
+
+public static class ExportEvaluator
+{
+    /// <summary>导出指定的值；没有样本的指标不出现在结果里。</summary>
+    public static Dictionary<string, double> Evaluate(MetricSet set, IEnumerable<string> exportIds, double durationSeconds)
+    {
+        var values = new Dictionary<string, double>(StringComparer.Ordinal);
+        foreach (string id in exportIds)
+        {
+            if (MetricRegistry.TryFindExport(id, out MetricDef def, out MetricExport export)
+                && set.TryGet(def.Id, out Accumulator acc)
+                && MetricDef.Export(acc, export, durationSeconds) is { } value
+                && double.IsFinite(value))
+            {
+                values[id] = value;
+            }
+        }
+
+        return values;
+    }
+
+    public static IEnumerable<string> AllExportIds() => MetricRegistry.AllExports().Select(e => e.Export.Id);
+}