88 lines
3 KiB
Markdown
88 lines
3 KiB
Markdown
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# InfluxDB Schema
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The following measurements are currently stored in InfluxDB:
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- `PROCESS_file_descriptors`
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- `PROCESS_gc_statistics`
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- `PROCESS_memory_usage`
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- `PROCESS_method_calls`
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- `PROCESS_object_counts`
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- `PROCESS_transactions`
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- `PROCESS_views`
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Here, `PROCESS` is replaced with either `rails` or `sidekiq` depending on the
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process type. In all series, any form of duration is stored in milliseconds.
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## PROCESS_file_descriptors
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This measurement contains the number of open file descriptors over time. The
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value field `value` contains the number of descriptors.
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## PROCESS_gc_statistics
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This measurement contains Ruby garbage collection statistics such as the amount
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of minor/major GC runs (relative to the last sampling interval), the time spent
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in garbage collection cycles, and all fields/values returned by `GC.stat`.
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## PROCESS_memory_usage
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This measurement contains the process' memory usage (in bytes) over time. The
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value field `value` contains the number of bytes.
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## PROCESS_method_calls
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This measurement contains the methods called during a transaction along with
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their duration, and a name of the transaction action that invoked the method (if
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available). The method call duration is stored in the value field `duration`,
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while the method name is stored in the tag `method`. The tag `action` contains
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the full name of the transaction action. Both the `method` and `action` fields
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are in the following format:
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```
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ClassName#method_name
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```
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For example, a method called by the `show` method in the `UsersController` class
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would have `action` set to `UsersController#show`.
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## PROCESS_object_counts
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This measurement is used to store retained Ruby objects (per class) and the
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amount of retained objects. The number of objects is stored in the `count` value
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field while the class name is stored in the `type` tag.
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## PROCESS_transactions
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This measurement is used to store basic transaction details such as the time it
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took to complete a transaction, how much time was spent in SQL queries, etc. The
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following value fields are available:
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| Value | Description |
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| ----- | ----------- |
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| `duration` | The total duration of the transaction |
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| `allocated_memory` | The amount of bytes allocated while the transaction was running. This value is only reliable when using single-threaded application servers |
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| `method_duration` | The total time spent in method calls |
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| `sql_duration` | The total time spent in SQL queries |
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| `view_duration` | The total time spent in views |
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## PROCESS_views
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This measurement is used to store view rendering timings for a transaction. The
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following value fields are available:
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| Value | Description |
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| ----- | ----------- |
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| `duration` | The rendering time of the view |
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| `view` | The path of the view, relative to the application's root directory |
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The `action` tag contains the action name of the transaction that rendered the
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view.
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---
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Read more on:
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- [Introduction to GitLab Performance Monitoring](introduction.md)
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- [GitLab Configuration](gitlab_configuration.md)
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- [InfluxDB Configuration](influxdb_configuration.md)
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