Fix Prometheus LTS alerts names

Change-Id: I5de6381336861a68ce0b7406b14da76a4d17d9e4
PROD-related: PROD-25600
diff --git a/prometheus/meta/prometheus.yml b/prometheus/meta/prometheus.yml
index 9d2755b..934076d 100644
--- a/prometheus/meta/prometheus.yml
+++ b/prometheus/meta/prometheus.yml
@@ -163,7 +163,7 @@
       annotations:
         summary: "Prometheus Long Term Storage service is down"
         description: "The Prometheus Long Term Storage service on the {{$labels.host}} node is down for 2 minutes."
-    PrometheusRelayServiceDownMajor:
+    PrometheusLTSServiceDownMajor:
       if: >-
         count(procstat_running{process_name="prometheus"} == 0) >= count(procstat_running{process_name="prometheus"}) * 0.5
       for: 2m
@@ -173,7 +173,7 @@
       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."
-    PrometheusRelayServiceOutage:
+    PrometheusLTSServiceOutage:
       if: >-
         count(procstat_running{process_name="prometheus"} == 0) == count(procstat_running{process_name="prometheus"})
       for: 2m