InfluxDB Schema
The following measurements are currently stored in InfluxDB:
PROCESS_file_descriptors
PROCESS_gc_statistics
PROCESS_memory_usage
PROCESS_method_calls
PROCESS_object_counts
PROCESS_transactions
PROCESS_views
events
Here, PROCESS
is replaced with either rails
or sidekiq
depending on the
process type. In all series, any form of duration is stored in milliseconds.
PROCESS_file_descriptors
This measurement contains the number of open file descriptors over time. The
value field value
contains the number of descriptors.
PROCESS_gc_statistics
This measurement contains Ruby garbage collection statistics such as the amount
of minor/major GC runs (relative to the last sampling interval), the time spent
in garbage collection cycles, and all fields/values returned by GC.stat
.
PROCESS_memory_usage
This measurement contains the process' memory usage (in bytes) over time. The
value field value
contains the number of bytes.
PROCESS_method_calls
This measurement contains the methods called during a transaction along with
their duration, and a name of the transaction action that invoked the method (if
available). The method call duration is stored in the value field duration
,
while the method name is stored in the tag method
. The tag action
contains
the full name of the transaction action. Both the method
and action
fields
are in the following format:
ClassName#method_name
For example, a method called by the show
method in the UsersController
class
would have action
set to UsersController#show
.
PROCESS_object_counts
This measurement is used to store retained Ruby objects (per class) and the
amount of retained objects. The number of objects is stored in the count
value
field while the class name is stored in the type
tag.
PROCESS_transactions
This measurement is used to store basic transaction details such as the time it took to complete a transaction, how much time was spent in SQL queries, etc. The following value fields are available:
Value | Description |
---|---|
duration |
The total duration of the transaction |
allocated_memory |
The amount of bytes allocated while the transaction was running. This value is only reliable when using single-threaded application servers |
method_duration |
The total time spent in method calls |
sql_duration |
The total time spent in SQL queries |
view_duration |
The total time spent in views |
PROCESS_views
This measurement is used to store view rendering timings for a transaction. The following value fields are available:
Value | Description |
---|---|
duration |
The rendering time of the view |
view |
The path of the view, relative to the application's root directory |
The action
tag contains the action name of the transaction that rendered the
view.
events
This measurement is used to store generic events such as the number of Git
pushes, Emails sent, etc. Each point in this measurement has a single value
field called count
. The value of this field is simply set to 1
. Each point
also has at least one tag: event
. This tag's value is set to the event name.
Depending on the event type additional tags may be available as well.
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