fix(agents): resolve rds_exporter port drift on pmm-agent reconnect - #5489
fix(agents): resolve rds_exporter port drift on pmm-agent reconnect#5489MuraliMon wants to merge 14 commits into
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Thanks for the fix — the root-cause analysis is correct: the cold-cache fallback filtered on the encrypted aws_options->>'aws_access_key' column while FindAgents decrypts only after the WHERE clause, so it matched zero rows. Matching in Go on the decrypted value is the right call and mirrors the grouping in state.go. A few changes before merge:
1. Trim the comment (roster.go:88-95)
The 8-line comment is more verbose than needed. The essential point is the encryption ordering. Suggest something like:
// aws_access_key is encrypted at rest, and FindAgents decrypts rows only
// after the WHERE clause, so a SQL filter on the access key never matches.
// Match it in Go on the decrypted value instead.2. Add a regression test (roster_test.go)
The current Get/Clear subtests hit the fallback branch but assert an empty result, so they pass identically with or without this fix — they don't cover the bug. Please add a test that:
- seeds a pmm-agent + an rds_exporter row with a non-empty
AWSOptions.AWSAccessKeyin the DB, - calls
r.get("<pmmAgentID>:rds/<accessKey>")on a cold roster (no prioradd), - asserts the exporter's
AgentIDis returned.
This fails before the fix and passes after, which is what guards against regression.
3. Clean up the now-dead filter
This was the only caller of AgentFilters.AWSAccessKey (verified repo-wide). With it gone, the struct field (agent_helpers.go:226) and the filter branch (agent_helpers.go:270-274) are orphaned — and that branch carries the same plaintext-vs-ciphertext defect, so leaving it is a footgun for the next person who reuses it. Please remove both in this PR.
4. Reference the real ticket
The PR body and commit use placeholders (PMM-0 / SUBMODULES-0). Please point them at the actual Jira ticket per team convention before merge.
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…econnect roster.get's cold-cache fallback filtered FindAgents by AWSAccessKey, which builds a SQL predicate on aws_options->>'aws_access_key'. That column is encrypted at rest (EncryptAWSOptionsHandler), and FindAgents decrypts rows only after the WHERE clause is applied, so the plaintext access key is compared against ciphertext and matches zero rows. This fallback runs when the in-memory roster has been cleared (e.g. after a pmm-agent reconnect). With an empty result the StateChanged handler updates no agents, leaving the grouped rds_exporter listen ports stale in the DB. VictoriaMetrics' scrape configuration is built from those ports, so it keeps scraping the old (now dead) ports and RDS metrics disappear until the roster cache is warm again. Fix: drop the encrypted-column SQL filter and match the access key in Go on the decrypted AWSOptions returned by FindAgents. This mirrors how the SetState builder groups rds_exporters and is correct regardless of column encryption. The cache-hit path is unchanged.
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@ademidoff Changes are done |
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #5489 +/- ##
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+ Coverage 43.59% 45.37% +1.78%
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Files 415 217 -198
Lines 43134 27898 -15236
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- Hits 18804 12660 -6144
+ Misses 22454 13864 -8590
+ Partials 1876 1374 -502 ☔ View full report in Codecov by Harness. 🚀 New features to boost your workflow:
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Thanks for the contribution!
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@4nte Can you please review and approve this? |
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@ademidoff What would be the next steps? |
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@MuraliMon, the PR is going to be tested by our QA team and then merged. |
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Included review availability: Your plan provides up to 4 included reviews per hour; 2 remain after this review. WalkthroughThe change removes AWS access-key filtering from agent queries. RDS roster lookup retrieves candidate exporters and compares decrypted keys in Go. A regression test verifies cold-cache lookup behavior. ChangesRDS roster access-key matching
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Actionable comments posted: 1
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Inline comments:
In `@managed/services/agents/roster.go`:
- Line 91: Update the AgentFilters initialization in the roster logic to use a
local models.AgentType value initialized to the required RDS exporter constant,
then pass that variable’s address as AgentType; remove the invalid
new(models.RDSExporterType) expression.
🪄 Autofix
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- Push a commit to this branch (recommended)
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managed/models/agent_helpers.gomanaged/services/agents/roster.gomanaged/services/agents/roster_test.go
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- managed/models/agent_helpers.go
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…Type) RDSExporterType is a typed constant, not a type, so new() cannot construct it. Assign it to a local variable and take its address instead. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
5 participants
PMM-14267
FB: Percona-Lab/pmm-submodules#4542
roster.get's cold-cache fallback filtered FindAgents by AWSAccessKey, which builds a SQL predicate on aws_options->>'aws_access_key'. That column is encrypted at rest (EncryptAWSOptionsHandler), and FindAgents decrypts rows only after the WHERE clause is applied, so the plaintext access key is compared against ciphertext and matches zero rows.
This fallback runs when the in-memory roster has been cleared (e.g. after a pmm-agent reconnect). With an empty result the StateChanged handler updates no agents, leaving the grouped rds_exporter listen ports stale in the DB. VictoriaMetrics' scrape configuration is built from those ports, so it keeps scraping the old (now dead) ports and RDS metrics disappear until the roster cache is warm again.
Fix: drop the encrypted-column SQL filter and match the access key in Go on the decrypted AWSOptions returned by FindAgents. This mirrors how the SetState builder groups rds_exporters and is correct regardless of column encryption. The cache-hit path is unchanged.
Ticket number: https://perconadev.atlassian.net/browse/PMM-14267
Feature build: SUBMODULES-0
If this PR adds, removes or alters one or more API endpoints, please review and update the relevant API documentation as well:
If this PR is related to other PRs, contributions, or ongoing work in this or other repositories, please reference them here: