Allow setting ring heartbeat timeout to zero to disable timeout check.#4342
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This change allows the various ring heartbeat timeouts to be configured with zero, as a means of disabling the timeout. This is expected to be used with a separate enhancement to allow disabling heartbeats. When the heartbeat timeout is disabled, instances will always appear as healthy in the ring. Signed-off-by: Steve Simpson <steve.simpson@grafana.com>
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stevesg
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Jul 6, 2021
stevesg
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pracucci
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This change LGTM. I guess we'll need a follow up PR to also allow disabling heartbeating the ring at all (this PR just checks the timeout). What your plans on this?
About this PR: I would mention it as an experimental feature in docs/configuration/v1-guarantees.md
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The two changes together were very confusing as they spread to so many bits of code in subtly different ways, so the disabling is here: #4344 |
Signed-off-by: Steve Simpson <steve.simpson@grafana.com>
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tomwilkie
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lgtm - I don't think the word "experimental" is necessary but not going to argue.
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cortexproject#4342) * Allow setting ring heartbeat timeout to zero to disable timeout check. This change allows the various ring heartbeat timeouts to be configured with zero, as a means of disabling the timeout. This is expected to be used with a separate enhancement to allow disabling heartbeats. When the heartbeat timeout is disabled, instances will always appear as healthy in the ring. Signed-off-by: Steve Simpson <steve.simpson@grafana.com> * Review comments. Signed-off-by: Steve Simpson <steve.simpson@grafana.com> Signed-off-by: Alvin Lin <alvinlin@amazon.com>
This was referenced Oct 22, 2025
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## What Removes the experimental feature that allowed setting heartbeat period or timeout to 0 to disable them. ## Why This feature was added in cortexproject/cortex#4342 but is not used in production. Removing unused experimental features simplifies the codebase and reduces maintenance burden. ## Changes - Remove "0 = disabled" from flag descriptions for `-*.ring.heartbeat-period` and `-*.ring.heartbeat-timeout` - Add validation to `LifecyclerConfig.Validate()` and `Config.Validate()` to reject zero values - Delete `TestRestartIngester_DisabledHeartbeat_unregister_on_shutdown_false` test - Update tests that were using zero heartbeat values to use non-zero values - Fix metric tests to use recent timestamps that work with non-zero heartbeat timeouts
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## What Removes support for setting heartbeat period or timeout to 0 to disable them. ## Why This experimental feature was added in cortexproject/cortex#4342 but is not used in production. Removing unused experimental features simplifies the codebase. ## Changes - Remove "Hash ring" section from experimental features documentation listing the heartbeat disabling flags - Add CHANGELOG entry under `[CHANGE]` scope - Update dskit dependency to include validation changes (via replace directive for now) ## Dependencies This PR depends on grafana/dskit#759 which must be merged first. After that PR is merged, this PR will be updated to: 1. Remove the replace directive 2. Update dskit to the merged commit 3. Update the CHANGELOG with the actual PR number
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What this PR does:
This change allows the various ring heartbeat timeouts to be configured
with zero, as a means of disabling the timeout. This is expected to be
used with a separate enhancement to allow disabling heartbeats. When the
heartbeat timeout is disabled, instances will always appear as healthy
in the ring.
Checklist
CHANGELOG.mdupdated - the order of entries should be[CHANGE],[FEATURE],[ENHANCEMENT],[BUGFIX]