http2: add a metric for debugging

Updates tailscale/corp#12296 Signed-off-by: Brad Fitzpatrick <[email protected]>
tailscale · Jun 26, 2023 · 874c5ea · 874c5ea
1 parent dd4570e
commit 874c5ea
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/http2/transport.go b/http2/transport.go
@@ -1283,6 +1283,10 @@ func (cc *ClientConn) RoundTrip(req *http.Request) (*http.Response, error) {
 			// is set, for example, in which case retrying on a different connection
 			// will not help.
 			cs.cc.doNotReuse = true
+
+			if f := cs.cc.t.CountError; f != nil {
+				f("abort_set_do_not_reuse")
+			}
 		}
 		cs.cc.mu.Unlock()
 		// Wait for the request body to be closed.