MitchDrage opened a new issue, #14397:
URL: https://github.com/apache/cloudstack/issues/14397
### problem
We run 3 management servers, and I noticed every VM gets 3 rows in vm_stats
each minute, one from each management server. Each MS polls every host for VM
stats and saves its own copy.
Here's one VM over 10 minutes:
```
mysql> SELECT mgmt_server_id, COUNT(*) FROM vm_stats
WHERE vm_id=3116 AND timestamp > NOW() - INTERVAL 10 MINUTE
GROUP BY mgmt_server_id;
+----------------+----------+
| mgmt_server_id | COUNT(*) |
+----------------+----------+
| 2 | 10 |
| 5 | 10 |
| 7 | 10 |
+----------------+----------+
```
So the table grows 3x faster than it needs to, and each host answers 3 stats
requests a minute where 1 would do. This gets noticeable once you raise
vm.stats.max.retention.time past the 12-hour default.
### versions
4.22.1.1 (also present on 4.20 and main)
### The steps to reproduce the bug
1. Run 2 or more management servers.
2. Count vm_stats rows for any running VM, grouped by mgmt_server_id.
### What to do about it?
VmStatsCollector in StatsCollector.java runs on every management server, and
each one collects stats from all hosts. Each management server should only
collect stats from the hosts connected to it.
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