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