Minor modifications to Istio alert descriptions

Author: carlosadiegosysdig

resources/istio/alerts.yaml

@@ -18,45 +18,53 @@ configurations:
           labels:
             severity: warning
           annotations:
-            description: Some of the Certificate Signing Request (CSR) were not correctly requested
+            description: Some of the Certificate Signing Requests (CSR) were not correctly requested.
         - alert: '[Istio-Pilot] Inbound listener rules conflicts'
           expr: |
             pilot_conflict_inbound_listener > 0
           for: 5m
           labels:
             severity: warning
           annotations:
-            description: There are some conflict with inbound listener rules
+            description: There are some conflicts with inbound listener rules.
         - alert: '[Istio-Pilot] Endpoint found in unready state'
           expr: |
             pilot_endpoint_not_ready > 0
           for: 5m
           labels:
             severity: warning
           annotations:
-            description: Endpoint found in unready state
+            description: Endpoint found in unready state.
         - alert: '[Istio] Unstable requests for sidecar injections'
           expr: |
             rate(sidecar_injection_requests_total[5m]) - rate(sidecar_injection_success_total[5m]) > 0
           for: 5m
           labels:
             severity: warning
           annotations:
-            description: Sidecar injections requests has no been successfully resolved
+            description: Sidecar injections requests are failing.
         - alert: '[Istio-Envoy] High 4xx RequestError Rate'
           expr: |
             sum (rate(istio_requests_total{ response_code=~"4..", reporter="source"}[5m]))/ sum (rate(istio_requests_total{ reporter="source"}[5m]))> 0.05
           for: 5m
           labels:
             severity: critical
           annotations:
-            description: High 4xx RequestError Rate
+            description: 4xx RequestError Rate is higher than 5%.
+        - alert: '[Istio-Envoy] High 5xx RequestError Rate'
+          expr: |
+            sum (rate(istio_requests_total{ response_code=~"5..", reporter="source"}[5m]))/ sum (rate(istio_requests_total{ reporter="source"}[5m]))> 0.05
+          for: 5m
+          labels:
+            severity: critical
+          annotations:
+            description: 5xx RequestError Rate is higher than 5%.
         - alert: '[Istio-Envoy] High Request Latency'
           expr: |
             histogram_quantile(0.95,sum(rate(envoy_cluster_upstream_cx_connect_ms_bucket[5m])) by (le)) > 100
           for: 5m
           labels:
             severity: critical
           annotations:
-            description: Envoy High Request Latency
+            description: Envoy Request Latency is higher than 100ms.