inflight-logging: Add extra metadata to inflight requests logging (#11243)

**What this PR does / why we need it**:
logging: Add extra metadata to inflight requests

This adds extra metadata (similar to what we have in `metrics.go`) but
for queries in in-flight (both started and retrying)

Changes:
    Adds following data
    1. Query Hash
    2. Start and End time
    3. Start and End delta
    4. Length of the query
5. Moved the helper util to `queryutil` package because of cyclic
dependencies with `logql` package.
   
**Which issue(s) this PR fixes**:
Fixes #<issue number>

**Special notes for your reviewer**:
Find the screenshots of log entries looks like (both in `retry.go` and
`roundtrip.go`)

![Screenshot 2023-11-16 at 13 01
32](https://github.com/grafana/loki/assets/3735252/177e97ed-6ee8-41dd-b088-2e4f49562ba0)
![Screenshot 2023-11-16 at 13 02
15](https://github.com/grafana/loki/assets/3735252/fb328a37-dbe3-483e-b083-f21327858029)

**Checklist**
- [x] Reviewed the
[`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md)
guide (**required**)
- [ ] Documentation added
- [x] Tests updated
- [x] `CHANGELOG.md` updated
- [ ] If the change is worth mentioning in the release notes, add
`add-to-release-notes` label
- [ ] Changes that require user attention or interaction to upgrade are
documented in `docs/sources/setup/upgrade/_index.md`
- [ ] For Helm chart changes bump the Helm chart version in
`production/helm/loki/Chart.yaml` and update
`production/helm/loki/CHANGELOG.md` and
`production/helm/loki/README.md`. [Example
PR](d10549e3ec)
- [ ] If the change is deprecating or removing a configuration option,
update the `deprecated-config.yaml` and `deleted-config.yaml` files
respectively in the `tools/deprecated-config-checker` directory.
[Example
PR](0d4416a4b0)

---------

Signed-off-by: Kaviraj <kavirajkanagaraj@gmail.com>

CHANGELOG.md

@@ -6,6 +6,7 @@
 
 ##### Enhancements
 
+* [11243](https://github.com/grafana/loki/pull/11243) **kavirajk**: Inflight-logging: Add extra metadata to inflight requests logging.
 * [11110](https://github.com/grafana/loki/pull/11003) **MichelHollands**: Change the default of the `metrics-namespace` flag to 'loki'.
 * [11086](https://github.com/grafana/loki/pull/11086) **kandrew5**: Helm: Allow topologySpreadConstraints
 * [11003](https://github.com/grafana/loki/pull/11003) **MichelHollands**: Add the `metrics-namespace` flag to change the namespace of metrics currently using cortex as namespace.

Makefile

@@ -42,6 +42,8 @@ BUILD_IMAGE_VERSION ?= 0.31.2
 # Docker image info
 IMAGE_PREFIX ?= grafana
 
+BUILD_IMAGE_PREFIX ?= grafana
+
 IMAGE_TAG ?= $(shell ./tools/image-tag)
 
 # Version info for binaries
@@ -102,7 +104,7 @@ RM := --rm
 TTY := --tty
 
 DOCKER_BUILDKIT ?= 1
-BUILD_IMAGE = BUILD_IMAGE=$(IMAGE_PREFIX)/loki-build-image:$(BUILD_IMAGE_VERSION)
+BUILD_IMAGE = BUILD_IMAGE=$(BUILD_IMAGE_PREFIX)/loki-build-image:$(BUILD_IMAGE_VERSION)
 PUSH_OCI=docker push
 TAG_OCI=docker tag
 ifeq ($(CI), true)

pkg/logql/blocker.go

@@ -8,6 +8,7 @@ import (
 	"github.com/go-kit/log/level"
 	"github.com/grafana/regexp"
 
+	"github.com/grafana/loki/pkg/util"
 	logutil "github.com/grafana/loki/pkg/util/log"
 	"github.com/grafana/loki/pkg/util/validation"
 )
@@ -43,7 +44,7 @@ func (qb *queryBlocker) isBlocked(ctx context.Context, tenant string) bool {
 	for _, b := range blocks {
 
 		if b.Hash > 0 {
-			if b.Hash == HashedQuery(query) {
+			if b.Hash == util.HashedQuery(query) {
 				level.Warn(logger).Log("msg", "query blocker matched with hash policy", "hash", b.Hash, "query", query)
 				return qb.block(b, typ, logger)
 			}

pkg/logql/blocker_test.go

@@ -12,6 +12,7 @@ import (
 
 	"github.com/grafana/loki/pkg/logproto"
 	"github.com/grafana/loki/pkg/logqlmodel"
+	"github.com/grafana/loki/pkg/util"
 	"github.com/grafana/loki/pkg/util/validation"
 )
 
@@ -124,7 +125,7 @@ func TestEngine_ExecWithBlockedQueries(t *testing.T) {
 			"correct FNV32 hash matches",
 			defaultQuery, []*validation.BlockedQuery{
 				{
-					Hash: HashedQuery(defaultQuery),
+					Hash: util.HashedQuery(defaultQuery),
 				},
 			}, logqlmodel.ErrBlocked,
 		},
@@ -132,7 +133,7 @@ func TestEngine_ExecWithBlockedQueries(t *testing.T) {
 			"incorrect FNV32 hash does not match",
 			defaultQuery, []*validation.BlockedQuery{
 				{
-					Hash: HashedQuery(defaultQuery) + 1,
+					Hash: util.HashedQuery(defaultQuery) + 1,
 				},
 			}, nil,
 		},

pkg/logql/engine.go

@@ -219,7 +219,7 @@ func (q *query) Exec(ctx context.Context) (logqlmodel.Result, error) {
 	)
 
 	if q.logExecQuery {
-		queryHash := HashedQuery(q.params.Query())
+		queryHash := util.HashedQuery(q.params.Query())
 		if GetRangeType(q.params) == InstantType {
 			level.Info(logutil.WithContext(ctx, q.logger)).Log("msg", "executing query", "type", "instant", "query", q.params.Query(), "query_hash", queryHash)
 		} else {

pkg/logql/engine_test.go

@@ -2669,7 +2669,7 @@ func TestHashingStability(t *testing.T) {
 		{`sum (count_over_time({app="myapp",env="myenv"} |= "error" |= "metrics.go" | logfmt [10s])) by(query_hash)`},
 	} {
 		params.qs = test.qs
-		expectedQueryHash := HashedQuery(test.qs)
+		expectedQueryHash := util.HashedQuery(test.qs)
 
 		// check that both places will end up having the same query hash, even though they're emitting different log lines.
 		require.Regexp(t,

pkg/logql/metrics.go

@@ -2,7 +2,6 @@ package logql
 
 import (
 	"context"
-	"hash/fnv"
 	"strconv"
 	"strings"
 	"time"
@@ -19,6 +18,7 @@ import (
 	"github.com/grafana/loki/pkg/logqlmodel"
 	logql_stats "github.com/grafana/loki/pkg/logqlmodel/stats"
 	"github.com/grafana/loki/pkg/querier/astmapper"
+	"github.com/grafana/loki/pkg/util"
 	"github.com/grafana/loki/pkg/util/constants"
 	"github.com/grafana/loki/pkg/util/httpreq"
 	util_log "github.com/grafana/loki/pkg/util/log"
@@ -120,7 +120,7 @@ func RecordRangeAndInstantQueryMetrics(
 	logValues = append(logValues, []interface{}{
 		"latency", latencyType, // this can be used to filter log lines.
 		"query", p.Query(),
-		"query_hash", HashedQuery(p.Query()),
+		"query_hash", util.HashedQuery(p.Query()),
 		"query_type", queryType,
 		"range_type", rt,
 		"length", p.End().Sub(p.Start()),
@@ -187,12 +187,6 @@ func RecordRangeAndInstantQueryMetrics(
 	recordUsageStats(queryType, stats)
 }
 
-func HashedQuery(query string) uint32 {
-	h := fnv.New32()
-	_, _ = h.Write([]byte(query))
-	return h.Sum32()
-}
-
 func RecordLabelQueryMetrics(
 	ctx context.Context,
 	log log.Logger,
@@ -225,7 +219,7 @@ func RecordLabelQueryMetrics(
 		"status", status,
 		"label", label,
 		"query", query,
-		"query_hash", HashedQuery(query),
+		"query_hash", util.HashedQuery(query),
 		"total_entries", stats.Summary.TotalEntriesReturned,
 	)
 
@@ -276,7 +270,7 @@ func RecordSeriesQueryMetrics(ctx context.Context, log log.Logger, start, end ti
 		"duration", time.Duration(int64(stats.Summary.ExecTime*float64(time.Second))),
 		"status", status,
 		"match", PrintMatches(match),
-		"query_hash", HashedQuery(PrintMatches(match)),
+		"query_hash", util.HashedQuery(PrintMatches(match)),
 		"total_entries", stats.Summary.TotalEntriesReturned)
 
 	if shard != nil {
@@ -316,7 +310,7 @@ func RecordStatsQueryMetrics(ctx context.Context, log log.Logger, start, end tim
 		"duration", time.Duration(int64(stats.Summary.ExecTime*float64(time.Second))),
 		"status", status,
 		"query", query,
-		"query_hash", HashedQuery(query),
+		"query_hash", util.HashedQuery(query),
 		"total_entries", stats.Summary.TotalEntriesReturned)
 
 	level.Info(logger).Log(logValues...)
@@ -346,7 +340,7 @@ func RecordVolumeQueryMetrics(ctx context.Context, log log.Logger, start, end ti
 		"latency", latencyType,
 		"query_type", queryType,
 		"query", query,
-		"query_hash", HashedQuery(query),
+		"query_hash", util.HashedQuery(query),
 		"start", start.Format(time.RFC3339Nano),
 		"end", end.Format(time.RFC3339Nano),
 		"start_delta", time.Since(start),

pkg/logql/metrics_test.go

@@ -18,6 +18,7 @@ import (
 	"github.com/grafana/loki/pkg/logproto"
 	"github.com/grafana/loki/pkg/logqlmodel"
 	"github.com/grafana/loki/pkg/logqlmodel/stats"
+	"github.com/grafana/loki/pkg/util"
 	"github.com/grafana/loki/pkg/util/httpreq"
 	util_log "github.com/grafana/loki/pkg/util/log"
 )
@@ -191,11 +192,11 @@ func Test_testToKeyValues(t *testing.T) {
 }
 
 func TestQueryHashing(t *testing.T) {
-	h1 := HashedQuery(`{app="myapp",env="myenv"} |= "error" |= "metrics.go" |= logfmt`)
-	h2 := HashedQuery(`{app="myapp",env="myenv"} |= "error" |= logfmt |= "metrics.go"`)
+	h1 := util.HashedQuery(`{app="myapp",env="myenv"} |= "error" |= "metrics.go" |= logfmt`)
+	h2 := util.HashedQuery(`{app="myapp",env="myenv"} |= "error" |= logfmt |= "metrics.go"`)
 	// check that it capture differences of order.
 	require.NotEqual(t, h1, h2)
-	h3 := HashedQuery(`{app="myapp",env="myenv"} |= "error" |= "metrics.go" |= logfmt`)
+	h3 := util.HashedQuery(`{app="myapp",env="myenv"} |= "error" |= "metrics.go" |= logfmt`)
 	// check that it evaluate same queries as same hashes, even if evaluated at different timestamps.
 	require.Equal(t, h1, h3)
 }

pkg/querier/queryrange/queryrangebase/retry.go

@@ -11,6 +11,7 @@ import (
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
 
+	"github.com/grafana/loki/pkg/util"
 	util_log "github.com/grafana/loki/pkg/util/log"
 )
 
@@ -73,6 +74,11 @@ func (r retry) Do(ctx context.Context, req Request) (Response, error) {
 		MaxRetries: 0,
 	}
 	bk := backoff.New(ctx, cfg)
+
+	start := req.GetStart()
+	end := req.GetEnd()
+	query := req.GetQuery()
+
 	for ; tries < r.maxRetries; tries++ {
 		if ctx.Err() != nil {
 			return nil, ctx.Err()
@@ -86,7 +92,19 @@ func (r retry) Do(ctx context.Context, req Request) (Response, error) {
 		httpResp, ok := httpgrpc.HTTPResponseFromError(err)
 		if !ok || httpResp.Code/100 == 5 {
 			lastErr = err
-			level.Error(util_log.WithContext(ctx, r.log)).Log("msg", "error processing request", "try", tries, "query", req.GetQuery(), "retry_in", bk.NextDelay(), "err", err)
+			level.Error(util_log.WithContext(ctx, r.log)).Log(
+				"msg", "error processing request",
+				"try", tries,
+				"query", query,
+				"query_hash", util.HashedQuery(query),
+				"start", start.Format(time.RFC3339Nano),
+				"end", end.Format(time.RFC3339Nano),
+				"start_delta", time.Since(start),
+				"end_delta", time.Since(end),
+				"length", end.Sub(start),
+				"retry_in", bk.NextDelay(),
+				"err", err,
+			)
 			bk.Wait()
 			continue
 		}

pkg/querier/queryrange/roundtrip.go

@@ -24,6 +24,7 @@ import (
 	base "github.com/grafana/loki/pkg/querier/queryrange/queryrangebase"
 	"github.com/grafana/loki/pkg/storage/chunk/cache"
 	"github.com/grafana/loki/pkg/storage/config"
+	"github.com/grafana/loki/pkg/util"
 	"github.com/grafana/loki/pkg/util/constants"
 	logutil "github.com/grafana/loki/pkg/util/log"
 )
@@ -247,8 +248,19 @@ func (r roundTripper) Do(ctx context.Context, req base.Request) (base.Response,
 			return nil, httpgrpc.Errorf(http.StatusBadRequest, err.Error())
 		}
 
-		queryHash := logql.HashedQuery(op.Query)
-		level.Info(logger).Log("msg", "executing query", "type", "range", "query", op.Query, "length", op.EndTs.Sub(op.StartTs), "step", op.Step, "query_hash", queryHash)
+		queryHash := util.HashedQuery(op.Query)
+		level.Info(logger).Log(
+			"msg", "executing query",
+			"type", "range",
+			"query", op.Query,
+			"start", op.StartTs.Format(time.RFC3339Nano),
+			"end", op.EndTs.Format(time.RFC3339Nano),
+			"start_delta", time.Since(op.StartTs),
+			"end_delta", time.Since(op.EndTs),
+			"length", op.EndTs.Sub(op.StartTs),
+			"step", op.Step,
+			"query_hash", queryHash,
+		)
 
 		switch e := expr.(type) {
 		case syntax.SampleExpr:
@@ -296,7 +308,7 @@ func (r roundTripper) Do(ctx context.Context, req base.Request) (base.Response,
 			return nil, httpgrpc.Errorf(http.StatusBadRequest, err.Error())
 		}
 
-		queryHash := logql.HashedQuery(op.Query)
+		queryHash := util.HashedQuery(op.Query)
 		level.Info(logger).Log("msg", "executing query", "type", "instant", "query", op.Query, "query_hash", queryHash)
 
 		switch expr.(type) {

pkg/ruler/compat.go

@@ -24,11 +24,11 @@ import (
 	"github.com/prometheus/prometheus/rules"
 	"github.com/prometheus/prometheus/template"
 
-	"github.com/grafana/loki/pkg/logql"
 	"github.com/grafana/loki/pkg/logql/syntax"
 	ruler "github.com/grafana/loki/pkg/ruler/base"
 	"github.com/grafana/loki/pkg/ruler/rulespb"
-	"github.com/grafana/loki/pkg/ruler/util"
+	rulerutil "github.com/grafana/loki/pkg/ruler/util"
+	"github.com/grafana/loki/pkg/util"
 )
 
 // RulesLimits is the one function we need from limits.Overrides, and
@@ -40,7 +40,7 @@ type RulesLimits interface {
 	RulerRemoteWriteURL(userID string) string
 	RulerRemoteWriteTimeout(userID string) time.Duration
 	RulerRemoteWriteHeaders(userID string) map[string]string
-	RulerRemoteWriteRelabelConfigs(userID string) []*util.RelabelConfig
+	RulerRemoteWriteRelabelConfigs(userID string) []*rulerutil.RelabelConfig
 	RulerRemoteWriteConfig(userID string, id string) *config.RemoteWriteConfig
 	RulerRemoteWriteQueueCapacity(userID string) int
 	RulerRemoteWriteQueueMinShards(userID string) int
@@ -60,7 +60,7 @@ type RulesLimits interface {
 // and passing an altered timestamp.
 func queryFunc(evaluator Evaluator, checker readyChecker, userID string, logger log.Logger) rules.QueryFunc {
 	return func(ctx context.Context, qs string, t time.Time) (promql.Vector, error) {
-		hash := logql.HashedQuery(qs)
+		hash := util.HashedQuery(qs)
 		detail := rules.FromOriginContext(ctx)
 		detailLog := log.With(logger, "rule_name", detail.Name, "rule_type", detail.Kind, "query", qs, "query_hash", hash)
 

pkg/ruler/evaluator_jitter.go

@@ -10,8 +10,8 @@ import (
 	"github.com/go-kit/log"
 	"github.com/go-kit/log/level"
 
-	"github.com/grafana/loki/pkg/logql"
 	"github.com/grafana/loki/pkg/logqlmodel"
+	"github.com/grafana/loki/pkg/util"
 )
 
 // EvaluatorWithJitter wraps a given Evaluator. It applies a consistent jitter based on a rule's query string by hashing
@@ -44,7 +44,7 @@ func NewEvaluatorWithJitter(inner Evaluator, maxJitter time.Duration, hasher has
 }
 
 func (e *EvaluatorWithJitter) Eval(ctx context.Context, qs string, now time.Time) (*logqlmodel.Result, error) {
-	logger := log.With(e.logger, "query", qs, "query_hash", logql.HashedQuery(qs))
+	logger := log.With(e.logger, "query", qs, "query_hash", util.HashedQuery(qs))
 	jitter := e.calculateJitter(qs, logger)
 
 	if jitter > 0 {

pkg/ruler/evaluator_remote.go

@@ -36,8 +36,8 @@ import (
 	"google.golang.org/grpc/keepalive"
 
 	"github.com/grafana/loki/pkg/loghttp"
-	"github.com/grafana/loki/pkg/logql"
 	"github.com/grafana/loki/pkg/logqlmodel"
+	"github.com/grafana/loki/pkg/util"
 	"github.com/grafana/loki/pkg/util/build"
 	"github.com/grafana/loki/pkg/util/constants"
 	"github.com/grafana/loki/pkg/util/httpreq"
@@ -220,7 +220,7 @@ func (r *RemoteEvaluator) query(ctx context.Context, orgID, query string, ts tim
 		args.Set("time", ts.Format(time.RFC3339Nano))
 	}
 	body := []byte(args.Encode())
-	hash := logql.HashedQuery(query)
+	hash := util.HashedQuery(query)
 
 	req := httpgrpc.HTTPRequest{
 		Method: http.MethodPost,

pkg/util/hash_fp.go

@@ -1,6 +1,10 @@
 package util
 
-import "github.com/prometheus/common/model"
+import (
+	"hash/fnv"
+
+	"github.com/prometheus/common/model"
+)
 
 // HashFP simply moves entropy from the most significant 48 bits of the
 // fingerprint into the least significant 16 bits (by XORing) so that a simple
@@ -12,3 +16,10 @@ import "github.com/prometheus/common/model"
 func HashFP(fp model.Fingerprint) uint32 {
 	return uint32(fp ^ (fp >> 32) ^ (fp >> 16))
 }
+
+// HashedQuery returns a unique hash value for the given `query`.
+func HashedQuery(query string) uint32 {
+	h := fnv.New32()
+	_, _ = h.Write([]byte(query))
+	return h.Sum32()
+}