rule: Alerts will not be deleted after curl -X POST localhost:10902/-/reload.

[Kirchen99]

Thanos, Prometheus and Golang version used:

0.8.1

What happened:
I deleted alerts file and used curl to reload thanos. But the alerts are still in thanos-ruler.

What you expected to happen:
The alerts should be disappeared from thanos-ruler

How to reproduce it (as minimally and precisely as possible):
kubectl apply -f rules.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: rule-test
  namespace: monitoring
data:
  test_rules_alerts.rules.yaml: |-
    groups:
    - name: test.alarm
      rules:
      - alert: TEST-ALARM
        expr: vector(1)

curl -X POST localhost:10902/-/reload.

Then the alert is in thanos-rule.
And now:

kubectl delete -f rules.yaml
curl -X POST localhost:10902/-/reload.

The alert is not disappeared.

Full logs to relevant components:

{"caller":"rule.go:441","level":"info","msg":"reload rule files","numFiles":1,"ts":"2019-11-11T14:45:15.926305365Z"}

{"caller":"rule.go:441","level":"info","msg":"reload rule files","numFiles":0,"ts":"2019-11-11T14:45:27.957372263Z"}

[GiedriusS]

Probably related to this: #1439

[stale]

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