feat: Add open telemetry (#2318)

* feat: add OpenTelemetry tracing infrastructure

Introduce distributed tracing capabilities using OpenTelemetry:

- Add @opentelemetry packages to shared-server for tracing
- Create tracing utility module with span helpers (withSpan, addSpanEvent, etc.)
- Add tRPC middleware for automatic span creation on API calls
- Initialize tracing in API and workers entry points
- Add demo instrumentation to bookmark creation and crawler worker
- Add configuration options (OTEL_TRACING_ENABLED, OTEL_EXPORTER_OTLP_ENDPOINT, etc.)
- Document tracing configuration in environment variables docs

When enabled, traces are collected for tRPC calls, bookmark creation flow,
and crawler operations, with support for any OTLP-compatible backend (Jaeger, Tempo, etc.)

* refactor: remove tracing from workers for now

Keep tracing infrastructure but remove worker instrumentation:
- Remove tracing initialization from workers entry point
- Remove tracing instrumentation from crawler worker
- Fix formatting in tracing files

The tracing infrastructure remains available for future use.

* add hono and next tracing

* remove extra span logging

* more fixes

* update config

* some fixes

* upgrade packages

* remove unneeded packages

---------

Co-authored-by: Claude <noreply@anthropic.com>

2 files changed, 8 insertions, 0 deletions

diff --git a/apps/web/instrumentation.node.ts b/apps/web/instrumentation.node.ts
new file mode 100644
index 00000000..2f4c1d58
--- /dev/null
+++ b/apps/web/instrumentation.node.ts
@@ -0,0 +1,3 @@
+import { initTracing } from "@karakeep/shared-server";
+
+initTracing("web");
diff --git a/apps/web/instrumentation.ts b/apps/web/instrumentation.ts
new file mode 100644
index 00000000..41630756
--- /dev/null
+++ b/apps/web/instrumentation.ts
@@ -0,0 +1,5 @@
+export async function register() {
+  if (process.env.NEXT_RUNTIME === "nodejs") {
+    await import("./instrumentation.node");
+  }
+}