http: run prometheus metrics collector on leader only

Metrics are collected and merged in http.prometheus, no need to be run
on every worker.

diff --git a/modules/http/http.lua b/modules/http/http.lua
index e4baf8fdde5cfd38aa114a5afd5723eefebd5074..a81935997ce828711d8abf4398fd3475e85ef824 100644 (file)
--- a/modules/http/http.lua
+++ b/modules/http/http.lua
@@ -366,7 +366,10 @@ end
 
 -- @function Init module
 function M.init()
-       worker.coroutine(prometheus.init)
+       -- collect and merge metrics only on leader
+       if worker.id == 0 then
+               worker.coroutine(prometheus.init)
+       end
 end
 
 -- @function Cleanup module