src: add tracing category macros

Adds `TRACING_CATEGORY_NODE`, `TRACING_CATEGORY_NODE1` and
`TRACING_CATEGORY_NODE2` helper macros for consistently building
trace event category strings. For instance,

`TRACING_CATEGORY_NODE2(foo, bar)` would generate the category
string `node,node.foo,node.foo.bar`, such that...

```
TRACE_EVENT_NESTABLE_ASYNC_BEGIN0(
    TRACING_CATEGORY_NODE2(foo, bar),
    "baz", 1);
```

Would emit if trace events are enabled for categories: `node`,
`node.foo`, or `node.foo.bar`.

This allows a natural scoping down of what trace events a user
may want to receive. Enabling the `node` category would receive
everything Node.js produces.

PR-URL: https://github.com/nodejs/node/pull/19155
Reviewed-By: Andreas Madsen <amwebdk@gmail.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/test/parallel/test-trace-events-async-hooks.js b/test/parallel/test-trace-events-async-hooks.js
index b15d83b07a..7fb11223c3 100644
--- a/test/parallel/test-trace-events-async-hooks.js
+++ b/test/parallel/test-trace-events-async-hooks.js
@@ -37,7 +37,7 @@ proc.once('exit', common.mustCall(() => {
     assert(traces.some((trace) => {
       if (trace.pid !== proc.pid)
         return false;
-      if (trace.cat !== 'node.async_hooks')
+      if (trace.cat !== 'node,node.async_hooks')
         return false;
       if (trace.name !== 'TIMERWRAP')
         return false;
@@ -48,7 +48,7 @@ proc.once('exit', common.mustCall(() => {
     assert(traces.some((trace) => {
       if (trace.pid !== proc.pid)
         return false;
-      if (trace.cat !== 'node.async_hooks')
+      if (trace.cat !== 'node,node.async_hooks')
         return false;
       if (trace.name !== 'Timeout')
         return false;