1. Jira Cloud
Create an API token at id.atlassian.com > Security > API tokens. Add the connection with your site URL (https://acme.atlassian.net), the project key (OPS), your Atlassian account email, and the token. The account needs Create issues on that project.
2. Jira Data Center
Create a personal access token under your profile. Add the connection with the server URL, the project key and the token, leaving the email field empty: that is how the integration knows to send it as a bearer token instead of Basic auth.
3. What gets created
An issue of type Task with the title as summary, the measured body as a plain-paragraph description, and labels realuptime plus your defaults (spaces become hyphens, as Jira requires). If your project has no Task type, rename or add one; the connector does not guess.
Go deeper
The full reference lives in the docs: API documentation. Error codes named above are each explained in the error-code reference.