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FAQ

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Bohan Zhang edited this page Jan 5, 2019 · 8 revisions

Frequently Asked Questions

```
 File "/home/ubuntu/ottertune/server/website/website/parser/base.py", line 302, in calculate_change_in_metrics
 assert adj_val >= 0, '{} wrong metric type '.format(met_name)
 AssertionError: pg_stat_user_tables.n_mod_since_analyze wrong metric type
```
This is because the value in metric_after.json is smaller than that in metric_before.json, the change is smaller than 0. If the metric type is MetricType.COUNTER, we calculate the change and require it is positive. Otherwise we set the metric as the value in metric_after.json. Thus, you can fix it by changing the metric type as 2 (MetricType.INFO) or 3 (MetricType.STATISTICS) in the metric fixture.