RUM-8448 Add ios.benchmark.bytes_deleted metric

Author: maxep

DatadogCore/Sources/Core/Storage/Files/File.swift

@@ -35,6 +35,9 @@ internal protocol ReadableFile {
     /// Name of this file.
     var name: String { get }
 
+    /// Current size of this file.
+    func size() throws -> UInt64
+
     /// Creates InputStream for reading the available data from this file.
     func stream() throws -> InputStream
 

DatadogCore/Sources/Core/Storage/FilesOrchestrator.swift

@@ -211,6 +211,12 @@ internal class FilesOrchestrator: FilesOrchestratorType {
 
     func delete(readableFile: ReadableFile, deletionReason: BatchDeletedMetric.RemovalReason) {
         do {
+#if DD_BENCHMARK
+            if case .intakeCode = deletionReason {
+                try bench.meter.counter(metric: "ios.benchmark.bytes_deleted")
+                    .increment(by: readableFile.size(), attributes: ["track": trackName])
+            }
+#endif
             try readableFile.delete()
             // Decrement pending batches at each batch deletion
             _pendingBatches.mutate { $0 -= 1 }

DatadogInternal/Sources/Benchmarks/BenchmarkProfiler.swift

@@ -87,6 +87,11 @@ public protocol BenchmarkCounter {
 }
 
 extension BenchmarkCounter {
+    /// Increment the counter by one.
+    public func increment(attributes: @autoclosure () -> [String: String] = [:]) {
+        add(value: 1, attributes: attributes())
+    }
+
     /// Increment the counter.
     ///
     /// - parameters:
@@ -99,7 +104,7 @@ extension BenchmarkCounter {
     ///
     /// - parameters:
     ///     - by: Amount to increment by.
-    public func increment<Integer>(by amount: Integer = 1, attributes: @autoclosure () -> [String: String] = [:]) where Integer: BinaryInteger {
+    public func increment<Integer>(by amount: Integer, attributes: @autoclosure () -> [String: String] = [:]) where Integer: BinaryInteger {
         add(value: Double(amount), attributes: attributes())
     }
 }