Service-Level Indicators (SLI)

A Service-Level Indicator (SLI) is a defined quantitative measure of some aspects of the service level. The query for an SLI is provider/tool-dependent and therefore each SLI-provider relies on a specific SLI configuration. The SLI configuration contains a list of indicators, which always consists of a name and the provider-specific query.

Service-Level Indicator

An SLI is a key-value pair with the SLI name as key and the provider-specific query as value.
An SLI configuration can contain any number of SLIs.

Provider-specific SLIs

Please follow the links to the provider-specific SLIs:

Add SLI configuration to a Service, Stage, or Project

Important: In the following commands, the value of the resourceUri must specify the SLI-provider that can fetch the declared SLIs. In case of Dynatrace, for example, the value of the resourceUri must be: dynatrace/sli.yaml.

To add an SLI configuration to a service, use the keptn add-resource command:

keptn add-resource --project=sockshop --stage=staging --service=carts --resource=sli-config.yaml  --resourceUri=dynatrace/sli.yaml

To add an SLI configuration to a stage, use the keptn add-resource command:
```
keptn add-resource --project=sockshop --stage=staging --resource=sli-config.yaml --resourceUri=dynatrace/sli.yaml
```
Note: This SLI configuration is applied for all services in this stage.
To add an SLI configuration to a project, use the keptn add-resource command:
```
keptn add-resource --project=sockshop --resource=sli-config.yaml --resourceUri=dynatrace/sli.yaml
```
Note: This SLI configuration is applied for all services in all stages of this project.

Example of multiple SLI configurations:

Let’s assume, we add the following SLI configurations to a project, stage, and service:

SLI configuration on project-level:

spec_version: "1.0"
indicators:
  throughput: "query A-1"
  error_rate: "query B-1"
  response_time_p95: "query C-1"

SLI configuration on stage-level:

spec_version: "1.0"
indicators:
  response_time_p95: "query C-2"
  response_time_p99: "query D-2"

SLI configuration on service-level:

spec_version: "1.0"
indicators:
  response_time_p99: "query D-3"
  sql-statements: "query E-3"

If an evaluation of a service gets triggered, the following SLI configuration will be used:

spec_version: "1.0"
indicators:
  throughput: "query A-1"         # SLI from project level
  error_rate: "query B-1"         # SLI from project-level
  response_time_p95: "query C-2"  # SLI from stage-level overrides SLI from project-level
  response_time_p99: "query D-3"  # SLI from service-level overrides SLI from stage-level
  sql-statements: "query E-3"     # SLI from service-level