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1. Add a new string formatter method getEndpoint() to TaskManagerLocation and ArchivedTaskManagerLocation that prints in the form of "${hostname}:${port}" to align the string formatter used by REST API.
2. Use a field named "location" (already used in JobExceptionsInfoWithHistory) endpoint" that represents TaskManager location endpoint (host + port) using the newly added string formatter method.
3. Update the front-end to adopt the new location endpoint field.
4. Rename the column name from "Host" to "LocationEndpoint" on the Web UI to reflect the change that both hostname and port are displayed.
5. Keep the old "host" field untouched for compatibility. Notice that the info stored in the old "host" field is inconsistent, sometimes only host is stored, sometimes host + port is stored, we 'll leave them as they were with a few comments to keep being compatible.

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