feat(api): metrics for Spotify API http requests

This will help evaluate how much we are being rate limited, and on what
routes it happens most.

src/open-telemetry/url-value-parser.service.spec.ts

@@ -0,0 +1,49 @@
+import { Test, TestingModule } from "@nestjs/testing";
+import { UrlValueParserService } from "./url-value-parser.service";
+
+describe("UrlValueParserService", () => {
+  let service: UrlValueParserService;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [UrlValueParserService],
+    }).compile();
+
+    service = module.get<UrlValueParserService>(UrlValueParserService);
+  });
+
+  it("should be defined", () => {
+    expect(service).toBeDefined();
+  });
+
+  describe("replacePathValues", () => {
+    it("works with default replacement", () => {
+      const replaced = service.replacePathValues(
+        "/in/world/14/userId/abca12d231"
+      );
+      expect(replaced).toBe("/in/world/#val/userId/#val");
+    });
+
+    it("works with custom replacement", () => {
+      const replaced = service.replacePathValues(
+        "/in/world/14/userId/abca12d231",
+        "<id>"
+      );
+      expect(replaced).toBe("/in/world/<id>/userId/<id>");
+    });
+
+    it("works with negative decimal numbers", () => {
+      const replaced = service.replacePathValues(
+        "/some/path/-154/userId/-ABC363AFE2"
+      );
+      expect(replaced).toBe("/some/path/#val/userId/-ABC363AFE2");
+    });
+
+    it("works with spotify ids", () => {
+      const replaced = service.replacePathValues(
+        "/v1/albums/2PzfMWIpq6JKucGhkS1X5M"
+      );
+      expect(replaced).toBe("/v1/albums/#val");
+    });
+  });
+});