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fix: improved postgres version parsing for explain plans in database_observability component #5131

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Merged
rgeyer merged 5 commits into from
Jan 5, 2026
Merged

fix: improved postgres version parsing for explain plans in database_observability component #5131

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edda5ed
Move semver parsing of postgres version into explain plan collector t…
rgeyer Dec 16, 2025
538fe4a
More guardrails for parsing the postgres versions with semver to supp…
rgeyer Dec 16, 2025
2debddf
More useful comments
rgeyer Dec 17, 2025
48c304a
Merge branch 'main' into rgeyer/dbo11y/fix/psql-version
rgeyer Dec 17, 2025
dcd39a2
Add percona version string test
rgeyer Dec 17, 2025
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17 changes: 13 additions & 4 deletions internal/component/database_observability/postgres/collector/explain_plan.go
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Original file line number Diff line number Diff line change
Expand Up @@ -50,6 +50,7 @@ var unrecoverablePostgresSQLErrors = []string{
}

var paramCountRegex = regexp.MustCompile(`\$\d+`)
var versSanitizeRegex = regexp.MustCompile(`^v?[0-9]+\.?[0-9]+`)

type PgSQLExplainplan struct {
Plan PlanNode `json:"Plan"`
Expand Down Expand Up @@ -214,7 +215,7 @@ type ExplainPlanArguments struct {
ExcludeSchemas []string
EntryHandler loki.EntryHandler
InitialLookback time.Time
DBVersion semver.Version
DBVersion string

Logger log.Logger
}
Expand All @@ -239,10 +240,9 @@ type ExplainPlan struct {
}

func NewExplainPlan(args ExplainPlanArguments) (*ExplainPlan, error) {
return &ExplainPlan{
ep := &ExplainPlan{
dbConnection: args.DB,
dbDSN: args.DSN,
dbVersion: args.DBVersion,
dbConnectionFactory: defaultDbConnectionFactory,
scrapeInterval: args.ScrapeInterval,
queryCache: make(map[string]*queryInfo),
Expand All @@ -253,7 +253,16 @@ func NewExplainPlan(args ExplainPlanArguments) (*ExplainPlan, error) {
entryHandler: args.EntryHandler,
logger: log.With(args.Logger, "collector", ExplainPlanCollector),
running: atomic.NewBool(false),
}, nil
}
// Pre-sanitize the version by removing any trailing characters before semver gets it
foundVers := versSanitizeRegex.FindString(args.DBVersion)
engineSemver, err := semver.ParseTolerant(foundVers)
if err != nil {
return ep, fmt.Errorf("failed to parse database engine version: %s: %w", args.DBVersion, err)
}
ep.dbVersion = engineSemver

return ep, nil
}

func (c *ExplainPlan) sendExplainPlansOutput(schemaName string, digest string, generatedAt string, result database_observability.ExplainProcessingResult, reason string, plan *database_observability.ExplainPlanNode) error {
Expand Down
85 changes: 57 additions & 28 deletions internal/component/database_observability/postgres/collector/explain_plan_test.go
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@matthewnolf matthewnolf Dec 17, 2025

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Should we add a test for the exact versions that are failing today?

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@rgeyer rgeyer Dec 17, 2025

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Did do, on lines 2293-2305. That said, this is just one of the failing version strings, but it's one I directly experienced with the postgres docker image.

I didn't get a chance to grab the full Percona version number that's failing, but the error is the same, semver is trying to parse spaces and special characters as a minor version. The changes (and the test) account for basically any combination of that.

Original file line number Diff line number Diff line change
Expand Up @@ -2255,37 +2255,66 @@ func TestNewExplainPlan(t *testing.T) {
entryHandler := loki.NewCollectingHandler()
defer entryHandler.Stop()

pre17ver, err := semver.ParseTolerant("14.1")
require.NoError(t, err)
t.Run("pre17 version", func(t *testing.T) {
pre17ver := "14.1"
pre17semver, err := semver.ParseTolerant(pre17ver)
require.NoError(t, err)

args := ExplainPlanArguments{
DB: db,
DSN: "postgres://user:pass@localhost:5432/testdb",
ScrapeInterval: time.Minute,
PerScrapeRatio: 0.1,
ExcludeSchemas: []string{"information_schema", "pg_catalog"},
EntryHandler: entryHandler,
InitialLookback: time.Now().Add(-time.Hour),
DBVersion: pre17ver,
Logger: logger,
}
args := ExplainPlanArguments{
DB: db,
DSN: "postgres://user:pass@localhost:5432/testdb",
ScrapeInterval: time.Minute,
PerScrapeRatio: 0.1,
ExcludeSchemas: []string{"information_schema", "pg_catalog"},
EntryHandler: entryHandler,
InitialLookback: time.Now().Add(-time.Hour),
DBVersion: pre17ver,
Logger: logger,
}

explainPlan, err := NewExplainPlan(args)
explainPlan, err := NewExplainPlan(args)

require.NoError(t, err)
require.NotNil(t, explainPlan)
assert.Equal(t, db, explainPlan.dbConnection)
assert.Equal(t, args.DSN, explainPlan.dbDSN)
assert.Equal(t, args.DBVersion, explainPlan.dbVersion)
assert.Equal(t, args.ScrapeInterval, explainPlan.scrapeInterval)
assert.Equal(t, args.PerScrapeRatio, explainPlan.perScrapeRatio)
assert.Equal(t, args.ExcludeSchemas, explainPlan.excludeSchemas)
assert.Equal(t, entryHandler, explainPlan.entryHandler)
assert.NotNil(t, explainPlan.queryCache)
assert.NotNil(t, explainPlan.queryDenylist)
assert.NotNil(t, explainPlan.finishedQueryCache)
assert.NotNil(t, explainPlan.running)
assert.False(t, explainPlan.running.Load())
require.NoError(t, err)
require.NotNil(t, explainPlan)
assert.Equal(t, db, explainPlan.dbConnection)
assert.Equal(t, args.DSN, explainPlan.dbDSN)
assert.Equal(t, pre17semver, explainPlan.dbVersion)
assert.Equal(t, args.ScrapeInterval, explainPlan.scrapeInterval)
assert.Equal(t, args.PerScrapeRatio, explainPlan.perScrapeRatio)
assert.Equal(t, args.ExcludeSchemas, explainPlan.excludeSchemas)
assert.Equal(t, entryHandler, explainPlan.entryHandler)
assert.NotNil(t, explainPlan.queryCache)
assert.NotNil(t, explainPlan.queryDenylist)
assert.NotNil(t, explainPlan.finishedQueryCache)
assert.NotNil(t, explainPlan.running)
assert.False(t, explainPlan.running.Load())
})

t.Run("version with trailing characters from docker image", func(t *testing.T) {
args := ExplainPlanArguments{
DBVersion: "16.10 (Debian 16.10-1.pgdg13+1)",
}

ep, err := NewExplainPlan(args)
require.NoError(t, err)

assert.Equal(t, ep.dbVersion.Major, uint64(16))
assert.Equal(t, ep.dbVersion.Minor, uint64(10))
assert.Equal(t, ep.dbVersion.Patch, uint64(0))
})

t.Run("version with trailing characters from percona helm", func(t *testing.T) {
args := ExplainPlanArguments{
DBVersion: "17.7 - Percona Server for PostgreSQL 17.7.1",
}

ep, err := NewExplainPlan(args)
require.NoError(t, err)

assert.Equal(t, ep.dbVersion.Major, uint64(17))
assert.Equal(t, ep.dbVersion.Minor, uint64(7))
assert.Equal(t, ep.dbVersion.Patch, uint64(0))
})
}

func TestExplainPlan_Name(t *testing.T) {
Expand Down
7 changes: 1 addition & 6 deletions internal/component/database_observability/postgres/component.go
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,6 @@ import (
"sync"
"time"

"github.com/blang/semver/v4"
"github.com/lib/pq"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
Expand Down Expand Up @@ -447,17 +446,13 @@ func (c *Component) startCollectors(systemID string, engineVersion string, cloud
c.collectors = append(c.collectors, ciCollector)

if collectors[collector.ExplainPlanCollector] {
engineSemver, err := semver.ParseTolerant(engineVersion)
if err != nil {
logStartError(collector.ExplainPlanCollector, "parse version", err)
}
epCollector, err := collector.NewExplainPlan(collector.ExplainPlanArguments{
DB: c.dbConnection,
DSN: string(c.args.DataSourceName),
ScrapeInterval: c.args.ExplainPlanArguments.CollectInterval,
PerScrapeRatio: c.args.ExplainPlanArguments.PerCollectRatio,
Logger: c.opts.Logger,
DBVersion: engineSemver,
DBVersion: engineVersion,
EntryHandler: entryHandler,
})
if err != nil {
Expand Down
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