new alert when error rate for a specific accout and plugin > 50%

prometheus-exporters/cronus-exporter/alerts/global/infra-frontend/cronus.alerts

@@ -40,6 +40,19 @@ groups:
     annotations:
       description: sending emails with aws ses relay high error rate greater than 50%
       summary: sending emails with aws ses relay high error rate greater than 50%
+  - alert: SendingEmailsHighErrorRateByProjectProvider
+    expr: sum (sum_over_time(cronus_event_mails_sent_error_provider_rate_perminute[5m]) OR on() vector(0)) by (project_name, provider) / sum (sum_over_time(cronus_event_mails_sent_provider_rate_perminute[5m]) OR on() vector(0)) by (project_name, provider) > 0.5
+    for: 15m
+    labels:
+      service: email
+      severity: warning
+      tier: os
+      playbook: docs/devops/alert/cronus/#send_email
+      kibana: "app/discover#/?_g=(filters:!(),refreshInterval:(pause:!t,value:0),time:(from:now-5m,to:now))&_a=(columns:!(_source),filters:!(('$state':(store:appState),meta:(alias:!n,disabled:!f,index:'logstash-*',key:kubernetes_labels_name,negate:!f,params:(query:cronus),type:phrase),query:(match_phrase:(kubernetes_labels_name:cronus)))),index:'logstash-*',interval:auto,query:(language:kuery,query:'%22email%20delivery%20result%20%231:%20%5C%22aws%5C%22%20250%22'),sort:!())"
+      support_group: email
+    annotations:
+      description: sending emails from project: {{ $labels.project_name  }} relay: {{ $labels.provider }} high error rate greater than 50%
+      summary: sending emails from project: {{ $labels.project_name  }} relay: {{ $labels.provider }} high error rate greater than 50%
   - alert: EmailHealthTest
     expr: avg (cronus_health_test) by (name) == 0
     for: 30m