Remove query params and product ID from span names (#1668)

* Fixes #1665 Query Params in Span Name

- adds a transform processor
- adds two rules for transforming span names:
  - Strip anything after a "?"
  - Replace productID with a token in "GET /api/products/{productID}"
    spans

* fix lint errors

* update changelog

---------

Co-authored-by: Juliano Costa <julianocosta89@outlook.com>

CHANGELOG.md

@@ -7,6 +7,8 @@ the release.
 
 ## Unreleased
 
+* [otel-col] strip high-cardinality segments of span names
+  ([#1668](https://github.com/open-telemetry/opentelemetry-demo/pull/1668))
 * [tests] run trace based tests concurrently
   ([#1659](https://github.com/open-telemetry/opentelemetry-demo/pull/1659))
 * [accountingservice] increase memory to 120MB

src/otelcollector/otelcol-config.yml

@@ -49,6 +49,14 @@ exporters:
 
 processors:
   batch:
+  transform:
+    error_mode: ignore
+    trace_statements:
+      - context: span
+        statements:
+          # could be removed when https://github.com/vercel/next.js/pull/64852 is fixed upstream
+          - replace_pattern(name, "\\?.*", "")
+          - replace_match(name, "GET /api/products/*", "GET /api/products/{productId}")
 
 connectors:
   spanmetrics:
@@ -57,7 +65,7 @@ service:
   pipelines:
     traces:
       receivers: [otlp]
-      processors: [batch]
+      processors: [transform, batch]
       exporters: [otlp, debug, spanmetrics]
     metrics:
       receivers: [docker_stats, httpcheck/frontendproxy, otlp, prometheus, redis, spanmetrics]