Fix Prometheus LTS alerts decsriptions

Change-Id: I472739aa05f3d00e48fa7883e10248f90b8ffa3f
Bug-Related: PROD-25600
diff --git a/prometheus/meta/prometheus.yml b/prometheus/meta/prometheus.yml
index 934076d..9fc5571 100644
--- a/prometheus/meta/prometheus.yml
+++ b/prometheus/meta/prometheus.yml
@@ -138,7 +138,7 @@
         service: prometheus
       annotations:
         summary: "50% of Prometheus relay services are down"
-        description: "{{ $value }} of Prometheus relay services (>= 50%) are down for 2 minutes."
+        description: "{{ $value }}% of Prometheus relay services (>= 50%) are down for 2 minutes."
     PrometheusRelayServiceOutage:
       if: >-
         count(procstat_running{process_name="prometheus-relay"} == 0) == count(procstat_running{process_name="prometheus-relay"})
@@ -172,7 +172,7 @@
         service: prometheus
       annotations:
         summary: "50% of Prometheus Long Term Storage services are down"
-        description: "{{ $value }} of Prometheus Long Term Storage services (>= 50%) are down for 2 minutes."
+        description: "{{ $value }}% of Prometheus Long Term Storage services (>= 50%) are down for 2 minutes."
     PrometheusLTSServiceOutage:
       if: >-
         count(procstat_running{process_name="prometheus"} == 0) == count(procstat_running{process_name="prometheus"})