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Add permet pool metrics to dynamo db backend #21742

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merged 6 commits into from
Aug 18, 2023

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jhillkwaj
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@jhillkwaj jhillkwaj commented Jul 10, 2023

See #21588

To aid in debugging we want to have metrics on the number of requests in the permit pool for the dynamodb backend and the number of waiting requests. This change implements this by adding NewPermitPoolWithMetrics which shadows the existing permit pool definition except with calls to publish metrics on the pool size, active requests. and waiting requests before and after each permit is acquired or released

Example metrics from Vault:
image

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hashicorp-cla commented Jul 10, 2023

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@@ -122,6 +123,12 @@ type DynamoDBLockRecord struct {
Expires int64
}

type PermitPoolWithMetrics struct {
physical.PermitPool
pendingPermits int32
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minor: run git fmt. It should align these types with spaces

@VioletHynes
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Hey! Thanks for adding this. It looks great to me. I added a changelog, and I'm going to try and get this one merged. Appreciate the contribution!

@VioletHynes VioletHynes merged commit 619f578 into hashicorp:main Aug 18, 2023
@jhillkwaj jhillkwaj deleted the dynamo-db-backend-metrics branch August 21, 2023 19:12
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4 participants