docs(metrics-operator): usage of SLI and SLO converters (#2013)

Signed-off-by: odubajDT <ondrej.dubaj@dynatrace.com>

metrics-operator/converter/sli_converter.md

@@ -0,0 +1,78 @@
+# SLI Converter
+
+SLI converter is a tool to convert the old `sli.yaml`
+[file format](https://github.com/keptn/spec/blob/master/service_level_indicator.md) into the new
+`AnalysisValueTemplate` [custom resource definition](../../docs/content/en/docs/crd-ref/metrics/v1alpha3/_index.md).
+The converter is part of `metrics-operator` image.
+
+## Usage
+
+The converter will convert a single `sli.yaml` file into multiple `AnalysisValueTemplate` resources.
+
+To run the converter, execute the following command:
+
+<!---x-release-please-start-version-->
+```shell
+METRICS_OPERATOR_IMAGE=ghcr.io/keptn/metrics-operator:v0.8.2
+PATH_TO_SLI=<PATH_TO_SLI>
+KEPTN_PROVIDER_NAME=<KEPTN_PROVIDER_NAME>
+KEPTN_PROVIDER_NAMESPACE=<KEPTN_PROVIDER_NAMESPACE>
+
+docker run $METRICS_OPERATOR_IMAGE manager --convert-sli=$PATH_TO_SLI --keptn-provider-name=$KEPTN_PROVIDER_NAME --keptn-provider-namespace=$KEPTN_PROVIDER_NAMESPACE
+```
+<!---x-release-please-end-->
+
+Please be aware, you need to substitute the placeholders with the following information:
+
+* **PATH_TO_SLI** - path to your `sli.yaml` file
+* **KEPTN_PROVIDER_NAME** - name of `KeptnMetricsProvider` which will be used to fetch SLIs
+* **KEPTN_PROVIDER_NAMESPACE** - namespace of `KeptnMetricsProvider` which will be used to fetch SLIs
+
+> **Note**
+
+All the SLIs present in `sli.yaml` file will use the same provider defined by the referenced
+`KeptnMetricsProvider`.
+
+## Example
+
+The following content of `sli.yaml` file
+
+```yaml
+spec_version: "1.0"
+indicators:
+  throughput: "builtin:service.requestCount.total:merge(0):count?scope=tag(keptn_project:$PROJECT),tag(keptn_stage:$STAGE),tag(keptn_service:$SERVICE),tag(keptn_deployment:$DEPLOYMENT)"
+  response_time_p95: "builtin:service.response.time:merge(0):percentile(95)?scope=tag(keptn_project:$PROJECT),tag(keptn_stage:$STAGE),tag(keptn_service:$SERVICE),tag(keptn_deployment:$DEPLOYMENT)"
+```
+
+with the following command
+
+```shell
+docker run $METRICS_OPERATOR_IMAGE manager --convert-sli=./sli.yaml --sli-provider=dynatrace --sli-namespace=keptn
+```
+
+will be converted to:
+
+```yaml
+---
+apiVersion: metrics.keptn.sh/v1alpha3
+kind: AnalysisValueTemplate
+metadata:
+  creationTimestamp: null
+  name: response_time_p95
+spec:
+  provider:
+    name: dynatrace
+    namespace: keptn
+  query: builtin:service.response.time:merge(0):percentile(95)?scope=tag(keptn_project:{{.project}}),tag(keptn_stage:{{.stage}}),tag(keptn_service:{{.service}}),tag(keptn_deployment:{{.deployment}})
+---
+apiVersion: metrics.keptn.sh/v1alpha3
+kind: AnalysisValueTemplate
+metadata:
+  creationTimestamp: null
+  name: throughput
+spec:
+  provider:
+    name: dynatrace
+    namespace: keptn
+  query: builtin:service.requestCount.total:merge(0):count?scope=tag(keptn_project:{{.project}}),tag(keptn_stage:{{.stage}}),tag(keptn_service:{{.service}}),tag(keptn_deployment:{{.deployment}})
+```