Core Concepts

Core Horreum concepts


A Team is a required top-level organizational and authorization construct.


A Folder is an optional organizational structure to hold Tests


A Schema is required by Horreum to define the meta-data associated with a Run

It allows Horreum to process the JSON content to provide validation, charting, and change detection

A Schema defines the following;

  1. An optional expected structure of a Dataset via a JSON Validation Schema
  2. Required Labels that define how to use the data in the JSON document
  3. Optional Transformers, to transform uploaded JSON documents into one or more datasets.

A Schema can apply to an entire Run JSON document, or parts of a Run JSON document


A Label is required to define how metrics are extracted from the JSON document and processed by Horreum.

Labels are defined by one or more required Extractors and an optional Combination Function

There are 2 types of Labels:

  • Metrics Label: Describes a metric to be used for analysis, e.g. “Max Throughput”, “process RSS”, “startup time” etc
  • Filtering Label: Describes a value that can be used for filtering Datasets and ensuring that datasets are comparable, e.g. “Cluster Node Count”, “Product version” etc

A Label can be defined as either a Metrics label, a Filtering label, or both.

Filtering Labels are combined into Fingerprints that uniquely identify comparable Datasets within uploaded Runs.


An Extractor is a required JSONPath expression that refers to a section of an uploaded JSON document. An Extractor can return one of:

  • A scalar value
  • An array of values
  • A subsection of the uploaded JSON document

Combination Function:

A Combination Function is an optional JavaScript function that takes all Extractor values as input and produces a Label value. See Function


A Test is a required repository for particular similar runs and datasets

You can think of a test as a repo for the results of a particular benchmark, i.e. a benchmark performs a certain set of actions against a system under test

Test Runs can have different configurations, making them not always directly comparable, but the Run results stored under one Test can be filtered by their Fingerprint to ensure that all Datasets used for analysis are comparable


A Run is a particular single upload instance of a Test

A Run is associated with one or more Schemas in order to define what data to expect, and how to process the JSON document


A Transformer is optionally defined on a Schema that applies required Extractors and a required Combination Function to transform a Run into one or more Datasets

Transformers are typically used to;

  • Restructure the JSON document. This is useful where users are processing JSON documents that they do not have control of the structure, and the structure is not well defined
  • Split a Run JSON output into multiple, non-comparable Datasets. This is useful where a benchmark iterates over a configuration and produces a JSON output that contains multiple results for different configurations

A Schema can have 0, 1 or multiple Transformers defined


A Dataset is either the entire Run JSON document, or a subset that has been produced by an optional Transformer

It is possible for a Run to include multiple Datasets, and the Transformer(s) defined on a Schema associated with the Run has the job of parsing out the multiple Datasets


A Fingerprint is combination of Filtering labels that unique identifies comparable datasets within a test


A Function is a JavaScript function that is executed on the server side. Functions can be used for validating expected data formats, substitution and rendering. Also used in Combination Functions to create derived metrics. See Define Functions for more detailed information.


A Datasource is a required top-level organizational construct that defines the source of the data to be stored or retrieved by Horreum. Currently, Horreum supports 2 types of Datasource: Postgres and Elasticsearch


The initial sample for an Experiment comparison. Configured in an Experiment Profile.

Change Detection Variable

Change detection tracks Schema Labels that have been configured as a Change Detection Variable.


This enables running a comparison between Runs for a particular Test. There can be multiple Profiles configured for an Experiment to check for a variety of desired conditions. The outcome status for each Profile condition will be one of the following:

  • SAME

Experiment Profile

A Profile consists of:

JSON validation schema

An optional schema added to a Test to validate uploaded Run JSON data.

Report Configuration

In Horreum a Report Configuration is used for compiling a summary of information to be displayed using tables.


A Report is an instance of a Report Configuration. Creation date and time is used for differentiating each Report.


An Action is the ability by Horreum to send an Event notification to an external system. These are added to a Test.

Global Action

Actions that occur globally in Horreum

Test Action

Actions only for a particular Test

Action allow list

Horreum will only allow generic HTTP requests to domains that have been pre-configured in Horreum by an Administrator.

API Filter Query

Horreum API provides query parameters that are JSONPath paths that filter operation results.