[FIX] Resolved issue causing deploy_esexporter.sh to fail when doing an upgrade-in-place and serviceMonitor CRD is not installed. (#747)

Author: gsmith-sas

CHANGELOG.md

@@ -1,4 +1,9 @@
 # SAS Viya Monitoring for Kubernetes
+## unreleased
+* **Logging**
+  * [FIX] Resolved issue causing deploy_esexporter.sh to fail when doing an upgrade-in-place and serviceMonitor CRD is not installed.
+
+
 ## Version 1.2.36 (15APR2025)
 * **Overall**
   * [ANNOUNCEMENT] As announced previously, this project now *requires*  the `yq` command-line processor for YAML.  Specifically, a recent version (4.32+) of the [Golang-based (Mike Farah) version of `yq`](https://github.com/mikefarah/yq)

logging/bin/deploy_esexporter.sh

@@ -47,12 +47,19 @@ if helm3ReleaseExists es-exporter $LOG_NS; then
       helm -n $LOG_NS delete es-exporter
    fi
 
-   monNamespace=$(kubectl get servicemonitor -A --field-selector=metadata.name=elasticsearch -l sas.com/monitoring-base=kube-viya-monitoring -o=custom-columns=NAMESPACE:.metadata.namespace --no-headers)
-   if [ -n "$monNamespace" ]; then
-      log_debug "Removing obsolete serviceMonitor [$monNamespace/elasticsearch]"
-      kubectl delete -n $monNamespace servicemonitor elasticsearch
-      log_debug "Deploying an updated serviceMonitor for Elasticsearch  [$monNamespace/elasticsearch-v2]"
-      kubectl apply  -n $monNamespace -f monitoring/monitors/logging/serviceMonitor-elasticsearch-v2.yaml
+   if kubectl get crd servicemonitors.monitoring.coreos.com 2>1 1>/dev/null; then
+      #serviceMonitor CRD may not be present if metric monitoring stack is not deployed
+      monNamespace=$(kubectl get servicemonitor -A --field-selector=metadata.name=elasticsearch -l sas.com/monitoring-base=kube-viya-monitoring -o=custom-columns=NAMESPACE:.metadata.namespace --no-headers)
+      if [ -n "$monNamespace" ]; then
+         log_debug "Removing obsolete serviceMonitor [$monNamespace/elasticsearch]"
+         kubectl delete -n $monNamespace servicemonitor elasticsearch
+         log_debug "Deploying an updated serviceMonitor for Elasticsearch  [$monNamespace/elasticsearch-v2]"
+         kubectl apply  -n $monNamespace -f monitoring/monitors/logging/serviceMonitor-elasticsearch-v2.yaml
+      else
+         log_debug "No instance of the obsolete elasticsearch serviceMonitor found."
+      fi
+   else
+      log_debug "No serviceMonitor CRD detected; skipping check for obsolete elasticseach serviceMonitor instance."
    fi
 else
    log_debug "No existing Helm release [es-exporter] found."