Backend image rendering as plugin (#11966)

* rendering: headless chrome progress

* renderer: minor change

* grpc: version hell

* updated grpc libs

* wip: minor progess

* rendering: new image rendering plugin is starting to work

* feat: now phantomjs works as well and updated alerting to use new rendering service

* refactor: renamed renderer package and service to rendering to make renderer name less confusing (rendering is internal service that handles the renderer plugin now)

* rendering: now render key is passed and render auth is working in plugin mode

* removed unneeded lines from gitignore

* rendering: now plugin mode supports waiting for all panels to complete rendering

* fix: LastSeenAt fix for render calls, was not set which causes a lot of updates to Last Seen at during rendering, this should fix sqlite db locked issues in seen in previous releases

* change: changed render tz url parameter to use proper timezone name as chrome does not handle UTC offset TZ values

* fix: another update to tz param generation

* renderer: added http mode to renderer service, new ini setting [rendering] server_url

vendor/github.com/smartystreets/assertions/internal/go-render/render/render.go

@@ -143,20 +143,24 @@ func (s *traverseState) render(buf *bytes.Buffer, ptrs int, v reflect.Value, imp
 		if !implicit {
 			writeType(buf, ptrs, vt)
 		}
-		structAnon := vt.Name() == ""
 		buf.WriteRune('{')
-		for i := 0; i < vt.NumField(); i++ {
-			if i > 0 {
-				buf.WriteString(", ")
-			}
-			anon := structAnon && isAnon(vt.Field(i).Type)
+		if rendered, ok := renderTime(v); ok {
+			buf.WriteString(rendered)
+		} else {
+			structAnon := vt.Name() == ""
+			for i := 0; i < vt.NumField(); i++ {
+				if i > 0 {
+					buf.WriteString(", ")
+				}
+				anon := structAnon && isAnon(vt.Field(i).Type)
 
-			if !anon {
-				buf.WriteString(vt.Field(i).Name)
-				buf.WriteRune(':')
-			}
+				if !anon {
+					buf.WriteString(vt.Field(i).Name)
+					buf.WriteRune(':')
+				}
 
-			s.render(buf, 0, v.Field(i), anon)
+				s.render(buf, 0, v.Field(i), anon)
+			}
 		}
 		buf.WriteRune('}')