mixin: Fix alert about unhealthy sidecar

The alert was giving the wrong information as the $value contained the number of pods that failing to send heartbeat instead of the actual number of seconds that each sidecar was being unhealthy. Also the 5 minute interval is probably too low as on large deployments prometheus could take much longer to come up online and for sidecar to become actually useful. As such, we can simply subtract the timestamp of the last heartbeat from the current time and fire if we are lagging for more than 10 minutes. Signed-off-by: Markos Chandras <[email protected]>
thanos-io · Aug 4, 2020 · 8960536 · 8960536
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -23,6 +23,7 @@ We use *breaking* word for marking changes that are not backward compatible (rel
 - [#2936](https://github.com/thanos-io/thanos/pull/2936) Compact: Fix ReplicaLabelRemover panic when replicaLabels are not specified.
 - [#2956](https://github.com/thanos-io/thanos/pull/2956) Store: Fix fetching of chunks bigger than 16000 bytes.
 - [#2970](https://github.com/thanos-io/thanos/pull/2970) Store: Upgrade minio-go/v7 to fix slowness when running on EKS.
+- [#2929](https://github.com/thanos-io/thanos/pull/2929) Mixin: Fix expression for 'unhealthy sidecar' alert and also increase the timeout for 10 minutes.
 
 ### Added
 

diff --git a/examples/alerts/alerts.md b/examples/alerts/alerts.md
@@ -275,7 +275,7 @@ rules:
     message: Thanos Sidecar {{$labels.job}} {{$labels.pod}} is unhealthy for {{ $value
       }} seconds.
   expr: |
-    count(time() - max(thanos_sidecar_last_heartbeat_success_time_seconds{job=~"thanos-sidecar.*"}) by (job, pod) >= 300) > 0
+    time() - max(thanos_sidecar_last_heartbeat_success_time_seconds{job=~"thanos-sidecar.*"}) by (job) >= 600
   labels:
     severity: critical
 ```

diff --git a/examples/alerts/alerts.yaml b/examples/alerts/alerts.yaml
@@ -258,7 +258,7 @@ groups:
       message: Thanos Sidecar {{$labels.job}} {{$labels.pod}} is unhealthy for {{
         $value }} seconds.
     expr: |
-      count(time() - max(thanos_sidecar_last_heartbeat_success_time_seconds{job=~"thanos-sidecar.*"}) by (job, pod) >= 300) > 0
+      time() - max(thanos_sidecar_last_heartbeat_success_time_seconds{job=~"thanos-sidecar.*"}) by (job) >= 600
     labels:
       severity: critical
 - name: thanos-store.rules

diff --git a/examples/alerts/tests.yaml b/examples/alerts/tests.yaml
@@ -22,47 +22,35 @@ tests:
       exp_samples:
         - labels: '{}'
           value: 120
-    - expr: max(thanos_sidecar_last_heartbeat_success_time_seconds{job="thanos-sidecar"}) by (pod)
+    - expr: max(thanos_sidecar_last_heartbeat_success_time_seconds{job="thanos-sidecar"}) by (job)
       eval_time: 2m
       exp_samples:
-        - labels: '{pod="thanos-sidecar-pod-0"}'
+        - labels: '{job="thanos-sidecar"}'
           value: 43
-        - labels: '{pod="thanos-sidecar-pod-1"}'
-          value: 42
-    - expr: max(thanos_sidecar_last_heartbeat_success_time_seconds{job="thanos-sidecar"}) by (pod)
-      eval_time: 5m
+    - expr: max(thanos_sidecar_last_heartbeat_success_time_seconds{job="thanos-sidecar"}) by (job)
+      eval_time: 10m
       exp_samples:
-        - labels: '{pod="thanos-sidecar-pod-0"}'
+        - labels: '{job="thanos-sidecar"}'
           value: 0
-        - labels: '{pod="thanos-sidecar-pod-1"}'
-          value: 0
-    - expr: max(thanos_sidecar_last_heartbeat_success_time_seconds{job="thanos-sidecar"}) by (pod)
-      eval_time: 6m
+    - expr: max(thanos_sidecar_last_heartbeat_success_time_seconds{job="thanos-sidecar"}) by (job)
+      eval_time: 11m
       exp_samples:
-        - labels: '{pod="thanos-sidecar-pod-0"}'
-          value: 0
-        - labels: '{pod="thanos-sidecar-pod-1"}'
+        - labels: '{job="thanos-sidecar"}'
           value: 0
-    - expr: time() - max(thanos_sidecar_last_heartbeat_success_time_seconds{job="thanos-sidecar"}) by (pod)
-      eval_time: 5m
+    - expr: time() - max(thanos_sidecar_last_heartbeat_success_time_seconds{job="thanos-sidecar"}) by (job)
+      eval_time: 10m
       exp_samples:
-        - labels: '{pod="thanos-sidecar-pod-0"}'
-          value: 300
-        - labels: '{pod="thanos-sidecar-pod-1"}'
-          value: 300
-    - expr: time() - max(thanos_sidecar_last_heartbeat_success_time_seconds{job="thanos-sidecar"}) by (pod)
-      eval_time: 6m
+        - labels: '{job="thanos-sidecar"}'
+          value: 600
+    - expr: time() - max(thanos_sidecar_last_heartbeat_success_time_seconds{job="thanos-sidecar"}) by (job)
+      eval_time: 11m
       exp_samples:
-        - labels: '{pod="thanos-sidecar-pod-0"}'
-          value: 360
-        - labels: '{pod="thanos-sidecar-pod-1"}'
-          value: 360
-    - expr: time() - max(thanos_sidecar_last_heartbeat_success_time_seconds{job="thanos-sidecar"}) by (pod) >= 300
+        - labels: '{job="thanos-sidecar"}'
+          value: 660
+    - expr: time() - max(thanos_sidecar_last_heartbeat_success_time_seconds{job="thanos-sidecar"}) by (job) >= 600
       eval_time: 12m
       exp_samples:
-        - labels: '{pod="thanos-sidecar-pod-0"}'
-          value: 720
-        - labels: '{pod="thanos-sidecar-pod-1"}'
+        - labels: '{job="thanos-sidecar"}'
           value: 720
   alert_rule_test:
   - eval_time: 1m
@@ -71,24 +59,27 @@ tests:
     alertname: ThanosSidecarUnhealthy
   - eval_time: 3m
     alertname: ThanosSidecarUnhealthy
-  - eval_time: 5m
+  - eval_time: 10m
     alertname: ThanosSidecarUnhealthy
     exp_alerts:
     - exp_labels:
         severity: critical
+        job: thanos-sidecar
       exp_annotations:
-        message: 'Thanos Sidecar   is unhealthy for 2 seconds.'
-  - eval_time: 6m
+        message: 'Thanos Sidecar thanos-sidecar  is unhealthy for 600 seconds.'
+  - eval_time: 11m
     alertname: ThanosSidecarUnhealthy
     exp_alerts:
     - exp_labels:
         severity: critical
+        job: thanos-sidecar
       exp_annotations:
-        message: 'Thanos Sidecar   is unhealthy for 2 seconds.'
+        message: 'Thanos Sidecar thanos-sidecar  is unhealthy for 660 seconds.'
   - eval_time: 12m
     alertname: ThanosSidecarUnhealthy
     exp_alerts:
     - exp_labels:
         severity: critical
+        job: thanos-sidecar
       exp_annotations:
-        message: 'Thanos Sidecar   is unhealthy for 2 seconds.'
+        message: 'Thanos Sidecar thanos-sidecar  is unhealthy for 720 seconds.'
diff --git a/mixin/alerts/sidecar.libsonnet b/mixin/alerts/sidecar.libsonnet
@@ -27,7 +27,7 @@
               message: 'Thanos Sidecar {{$labels.job}} {{$labels.pod}} is unhealthy for {{ $value }} seconds.',
             },
             expr: |||
-              count(time() - max(thanos_sidecar_last_heartbeat_success_time_seconds{%(selector)s}) by (job, pod) >= 300) > 0
+              time() - max(thanos_sidecar_last_heartbeat_success_time_seconds{%(selector)s}) by (job) >= 600
             ||| % thanos.sidecar,
             labels: {
               severity: 'critical',