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sql: add troubleshooting mode session variable
Resolves: cockroachdb#84429 This change introduces a `troubleshooting_mode_enabled` session variable. When enabled, this session variable is intended to be used as a way to avoid performing additional work on queries, particularly when the cluster is experiencing issues/unavailability/failure. By default, this session variable is disabled. Currently, this session variable is only used to avoid collecting/emitting telemetry data. Release note (sql change): Introduce new `troubleshooting_mode_enabled` session variable, to avoid doing additional work on queries when possible (i.e. collection telemetry data). By default, this session variable is disabled.
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Thomas Hardy
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Jul 21, 2022
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