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Kamil Trzciński 2018-09-05 22:01:17 +02:00
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doc/development/prometheus_metrics.md
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@ -6,8 +6,7 @@ We strive to support the 2-4 most important metrics for each common system servi
### Query identifier
The requirement for adding a new metrics is to make each query to have an unique identifier.
Identifier is used to update the metric later when changed.
The requirement for adding a new metric is to make each query to have an unique identifier which is used to update the metric later when changed:
```yaml
- group: Response metrics (NGINX Ingress)
@ -25,9 +24,10 @@ Identifier is used to update the metric later when changed.
After you add or change existing _common_ metric you have to create a new database migration that will query and update all existing metrics.
**Note: If a query metric (which is identified by `id:`) is removed it will not be removed from database by default.**
**You might want to add additional database migration that makes a decision what to do with removed one.**
**For example: you might be interested in migrating all dependent data to a different metric.**
NOTE: **Note:**
If a query metric (which is identified by `id:`) is removed it will not be removed from database by default.
You might want to add additional database migration that makes a decision what to do with removed one.
For example: you might be interested in migrating all dependent data to a different metric.
```ruby
class ImportCommonMetrics < ActiveRecord::Migration