Update README.md

Error Monitoring

README.md

@@ -60,3 +60,11 @@ Tag: `crawl_results_legacy`
 1. In workflow settings vars set `dev_name: dev` to process sampled data in dev workspace.
 2. Change `current_month` variable to a month in the past. May be helpful for testing pipelines based on `chrome-ux-report` data.
 3. `definitions/extra/test_env.sqlx` script helps to setup the tables required to run pipelines when in dev workspace. It's disabled by default.
+
+### Error Monitoring
+
+The issues within the pipeline are being tracked using the following alerts:
+1. the event trigger processing fails - [Dataform Trigger Function Error](https://console.cloud.google.com/monitoring/alerting/policies/3950167380893746326?authuser=7&project=httparchive)
+2. a job in the workflow fails - "[Dataform Workflow Invocation Failed](https://console.cloud.google.com/monitoring/alerting/policies/7137542315653007241?authuser=7&project=httparchive)
+
+Error notifications are sent to [#10x-infra](https://httparchive.slack.com/archives/C030V4WAVL3) Slack channel.