Scrape duration using prometheus is increasing continuously until restart

### problem

We are using Prometheus to scrape metrics from the management server.
We see a issue that the scrape_duration_seconds metric for the cloudstack job is increasing in slow pace and after ~7-10 days the scrape duration is longer then the configured interval and we get no more metrics.
First time we saw this just doing a time curl towards the mangement server it took 40-50s for metrics to come back.

### versions

CloudStack 4.22.0.0

### The steps to reproduce the bug

1. Start scraping
2. See the scrape_duration_seconds{job="cloudstack"} increasing daily.

### What to do about it?

1. Restart the management server solves the issue, temporarily

Comece pelo endpoint de métricas do Prometheus do servidor de gerenciamento do CloudStack e reproduza o problema fazendo scraping dele por vários dias enquanto observa scrape_duration_seconds{job="cloudstack"}. Compare o tempo de resposta do endpoint com o intervalo de scraping configurado; considera-se concluído quando a duração do scraping não aumentar mais continuamente e as métricas permanecerem disponíveis sem reiniciar o servidor de gerenciamento.

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