Add boot42-otel module: Spring Boot 4.2.0-RC1 OpenTelemetry conventions, shared OTLP settings and MDC keys vs 4.1.2

2026-10-22 18:37:10 +00:00
parent 917d39fb65
commit 8252cba4c5
29 changed files with 958 additions and 0 deletions
@@ -0,0 +1,41 @@
+package com.ankurm.otel;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
+
+/** Collects lines and writes output/NN-name[-on-4.1.2].txt. Tests assert what they write. */
+final class Transcript {
+
+	static final String LABEL = System.getProperty("boot.label", "4.2.0-RC1");
+
+	static boolean is42() {
+		return LABEL.startsWith("4.2");
+	}
+
+	private final List<String> lines = new ArrayList<>();
+	private final Path file;
+
+	Transcript(String name) {
+		String suffix = is42() ? "" : "-on-" + LABEL;
+		this.file = Path.of("output", name + suffix + ".txt");
+		line("# " + name + "  (Spring Boot " + LABEL + ", JDK " + Runtime.version().feature() + ")");
+	}
+
+	Transcript line(String s) {
+		lines.add(s);
+		return this;
+	}
+
+	void write() {
+		try {
+			Files.createDirectories(file.getParent());
+			Files.write(file, lines);
+		}
+		catch (IOException ex) {
+			throw new IllegalStateException(ex);
+		}
+	}
+}