Update README

README.md

@@ -1,6 +1,6 @@
 # junit2jira
 
-Convert test failures to jira issues
+Utility tools for handling test failures
 
 ### Build
 ```shell
@@ -14,6 +14,16 @@ go test ./...
 
 ### Usage
 
+This repo provides two cli tools:
+- junit2jira
+- flakechecker
+
+### junit2jira
+
+`junit2jira` supports conversion of test failures to jira issues. It also posts Slack messages for new failures and imports test results into DB.
+
+*Usage*
+
 ```shell
 Usage of junit2jira:
   -base-link string
@@ -51,7 +61,7 @@ Usage of junit2jira:
     	print version information and exit
 ```
 
-## Example usage
+*Example usage*
 ```shell
 JIRA_TOKEN="..." junit2jira \
   -jira-url "https://..." \
@@ -65,3 +75,45 @@ JIRA_TOKEN="..." junit2jira \
   -timestamp $(date --rfc-3339=seconds)
   -csv-output -
 ```
+
+### flakechecker
+
+`flakechecker` helps prevent unnecessary CI pipeline failures by suppressing known flaky tests that are within the allowed failure thresholds.
+
+`flakechecker` relies on several components:
+- collected test results from `junit2jira`: we generate a table of flaky tests, including their failure ratios for the last 30 executions.
+- flaky test configuration: we define and provide a `flakechecker` configuration with allowed failure ratio thresholds for known flaky tests.
+- CI pipeline integration script: `flakechecker` is executed as the last step in a CI pipeline, and provided results allow the CI pipeline script to report success or failure.
+
+ The `flakechecker` expects at least one failed test. It will return an error if it is executed on test results without any failures.
+
+`flakechecker` decision making:
+- it checks if a failed test in a CI pipeline is listed as flaky in the provided configuration.
+- if the test is not found in the flaky tests config -> it will cause the CI pipeline to fail. (test not found)
+- if the test is found in the configuration, `flakechecker` will fetch information about the fail ratio for that test from the database. If we have fewer than 30 executions for that test -> it will cause the CI pipeline to fail. (insufficient historical test results)
+- if the test's failure ratio in the database exceeds the threshold defined in the config -> it will cause the CI pipeline to fail. (flake ratio is above the allowed threshold)
+- if a flaky test's failure ratio is below the defined threshold -> it will report the test as a success in the CI pipeline. (test suppression)
+
+The `flakechecker` will apply this logic for each failed test in the CI pipeline.
+
+*Usage*
+
+```
+Usage of flakechecker:
+  -config-file string
+        Config file with allowed flakes.
+  -debug
+        Enable debug log level.
+  -job-name string
+        Name of CI job.
+  -junit-reports-dir string
+        Directory containing JUnit report XML files.
+  -v    short alias for -version
+  -version
+        print version information and exit
+```
+
+*Example usage*
+```
+flakechecker --config-file flake-config.yml --job-name "${JOB_NAME}" -junit-reports-dir "${ARTIFACT_DIR}"
+```