[ARVADOS] created: 2.1.0-1350-g02b35f748
Git user
git at public.arvados.org
Wed Sep 15 20:30:50 UTC 2021
at 02b35f7480e2792377e2ed23f740fff4b53badb9 (commit)
commit 02b35f7480e2792377e2ed23f740fff4b53badb9
Author: Tom Clegg <tom at curii.com>
Date: Wed Sep 15 16:24:50 2021 -0400
18051: Add debug logging for webdav cache.
Arvados-DCO-1.1-Signed-off-by: Tom Clegg <tom at curii.com>
diff --git a/services/keep-web/cache.go b/services/keep-web/cache.go
index ee61d1344..d2c79326a 100644
--- a/services/keep-web/cache.go
+++ b/services/keep-web/cache.go
@@ -334,12 +334,15 @@ func (c *cache) Get(arv *arvadosclient.ArvadosClient, targetID string, forceRelo
if pdh == "" {
// UUID->PDH mapping is not cached, might as well get
// the whole collection record and be done (below).
+ c.logger.Debugf("cache(%s): have no pdh", targetID)
} else if cached := c.lookupCollection(arv.ApiToken + "\000" + pdh); cached == nil {
// PDH->manifest is not cached, might as well get the
// whole collection record (below).
+ c.logger.Debugf("cache(%s): have pdh %s but manifest is not cached", targetID, pdh)
} else if !pdhRefresh {
// We looked up UUID->PDH very recently, and we still
// have the manifest for that PDH.
+ c.logger.Debugf("cache(%s): have pdh %s and refresh not needed", targetID, pdh)
return cached, nil
} else {
// Get current PDH for this UUID (and confirm we still
@@ -355,11 +358,13 @@ func (c *cache) Get(arv *arvadosclient.ArvadosClient, targetID string, forceRelo
if current.PortableDataHash == pdh {
// PDH has not changed, cached manifest is
// correct.
- return cached, err
+ c.logger.Debugf("cache(%s): verified cached pdh %s is still correct", targetID, pdh)
+ return cached, nil
}
if cached := c.lookupCollection(arv.ApiToken + "\000" + current.PortableDataHash); cached != nil {
// PDH changed, and we already have the
// manifest for that new PDH.
+ c.logger.Debugf("cache(%s): cached pdh %s was stale, new pdh is %s and manifest is already in cache", targetID, pdh, current.PortableDataHash)
return cached, nil
}
}
@@ -372,6 +377,7 @@ func (c *cache) Get(arv *arvadosclient.ArvadosClient, targetID string, forceRelo
if err != nil {
return nil, err
}
+ c.logger.Debugf("cache(%s): retrieved manifest, caching with pdh %s", targetID, retrieved.PortableDataHash)
exp := time.Now().Add(time.Duration(c.config.TTL))
if targetID != retrieved.PortableDataHash {
c.pdhs.Add(targetID, &cachedPDH{
commit e4752e29dd45110b70d408e5b648cba8357bb5ea
Author: Tom Clegg <tom at curii.com>
Date: Wed Sep 15 15:45:40 2021 -0400
18051: Add logging capability to webdav cache.
Arvados-DCO-1.1-Signed-off-by: Tom Clegg <tom at curii.com>
diff --git a/services/keep-web/cache.go b/services/keep-web/cache.go
index 16fbd0788..ee61d1344 100644
--- a/services/keep-web/cache.go
+++ b/services/keep-web/cache.go
@@ -14,6 +14,7 @@ import (
"git.arvados.org/arvados.git/sdk/go/keepclient"
lru "github.com/hashicorp/golang-lru"
"github.com/prometheus/client_golang/prometheus"
+ "github.com/sirupsen/logrus"
)
const metricsUpdateInterval = time.Second / 10
@@ -21,6 +22,7 @@ const metricsUpdateInterval = time.Second / 10
type cache struct {
cluster *arvados.Cluster
config *arvados.WebDAVCacheConfig // TODO: use cluster.Collections.WebDAV instead
+ logger logrus.FieldLogger
registry *prometheus.Registry
metrics cacheMetrics
pdhs *lru.TwoQueueCache
diff --git a/services/keep-web/cache_test.go b/services/keep-web/cache_test.go
index 80e00b02a..3e2faaff7 100644
--- a/services/keep-web/cache_test.go
+++ b/services/keep-web/cache_test.go
@@ -10,6 +10,7 @@ import (
"git.arvados.org/arvados.git/sdk/go/arvados"
"git.arvados.org/arvados.git/sdk/go/arvadosclient"
"git.arvados.org/arvados.git/sdk/go/arvadostest"
+ "git.arvados.org/arvados.git/sdk/go/ctxlog"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/expfmt"
"gopkg.in/check.v1"
@@ -33,7 +34,7 @@ func (s *UnitSuite) TestCache(c *check.C) {
arv, err := arvadosclient.MakeArvadosClient()
c.Assert(err, check.Equals, nil)
- cache := newConfig(s.Config).Cache
+ cache := newConfig(ctxlog.TestLogger(c), s.Config).Cache
cache.registry = prometheus.NewRegistry()
// Hit the same collection 5 times using the same token. Only
@@ -110,7 +111,7 @@ func (s *UnitSuite) TestCacheForceReloadByPDH(c *check.C) {
arv, err := arvadosclient.MakeArvadosClient()
c.Assert(err, check.Equals, nil)
- cache := newConfig(s.Config).Cache
+ cache := newConfig(ctxlog.TestLogger(c), s.Config).Cache
cache.registry = prometheus.NewRegistry()
for _, forceReload := range []bool{false, true, false, true} {
@@ -129,7 +130,7 @@ func (s *UnitSuite) TestCacheForceReloadByUUID(c *check.C) {
arv, err := arvadosclient.MakeArvadosClient()
c.Assert(err, check.Equals, nil)
- cache := newConfig(s.Config).Cache
+ cache := newConfig(ctxlog.TestLogger(c), s.Config).Cache
cache.registry = prometheus.NewRegistry()
for _, forceReload := range []bool{false, true, false, true} {
diff --git a/services/keep-web/handler_test.go b/services/keep-web/handler_test.go
index a74b85b98..55c122b0f 100644
--- a/services/keep-web/handler_test.go
+++ b/services/keep-web/handler_test.go
@@ -50,7 +50,7 @@ func (s *UnitSuite) SetUpTest(c *check.C) {
}
func (s *UnitSuite) TestCORSPreflight(c *check.C) {
- h := handler{Config: newConfig(s.Config)}
+ h := handler{Config: newConfig(ctxlog.TestLogger(c), s.Config)}
u := mustParseURL("http://keep-web.example/c=" + arvadostest.FooCollection + "/foo")
req := &http.Request{
Method: "OPTIONS",
@@ -109,7 +109,7 @@ func (s *UnitSuite) TestEmptyResponse(c *check.C) {
c.Assert(err, check.IsNil)
}
- h := handler{Config: newConfig(s.Config)}
+ h := handler{Config: newConfig(ctxlog.TestLogger(c), s.Config)}
u := mustParseURL("http://" + arvadostest.FooCollection + ".keep-web.example/foo")
req := &http.Request{
Method: "GET",
@@ -159,7 +159,7 @@ func (s *UnitSuite) TestInvalidUUID(c *check.C) {
RequestURI: u.RequestURI(),
}
resp := httptest.NewRecorder()
- cfg := newConfig(s.Config)
+ cfg := newConfig(ctxlog.TestLogger(c), s.Config)
cfg.cluster.Users.AnonymousUserToken = arvadostest.AnonymousToken
h := handler{Config: cfg}
h.ServeHTTP(resp, req)
@@ -1241,7 +1241,7 @@ func (s *IntegrationSuite) checkUploadDownloadRequest(c *check.C, h *handler, re
}
func (s *IntegrationSuite) TestDownloadLoggingPermission(c *check.C) {
- config := newConfig(s.ArvConfig)
+ config := newConfig(ctxlog.TestLogger(c), s.ArvConfig)
h := handler{Config: config}
u := mustParseURL("http://" + arvadostest.FooCollection + ".keep-web.example/foo")
@@ -1314,7 +1314,7 @@ func (s *IntegrationSuite) TestDownloadLoggingPermission(c *check.C) {
}
func (s *IntegrationSuite) TestUploadLoggingPermission(c *check.C) {
- config := newConfig(s.ArvConfig)
+ config := newConfig(ctxlog.TestLogger(c), s.ArvConfig)
h := handler{Config: config}
for _, adminperm := range []bool{true, false} {
diff --git a/services/keep-web/main.go b/services/keep-web/main.go
index a62e0abb6..a9ac834a2 100644
--- a/services/keep-web/main.go
+++ b/services/keep-web/main.go
@@ -29,7 +29,7 @@ type Config struct {
cluster *arvados.Cluster
}
-func newConfig(arvCfg *arvados.Config) *Config {
+func newConfig(logger logrus.FieldLogger, arvCfg *arvados.Config) *Config {
cfg := Config{}
var cls *arvados.Cluster
var err error
@@ -39,6 +39,7 @@ func newConfig(arvCfg *arvados.Config) *Config {
cfg.cluster = cls
cfg.Cache.config = &cfg.cluster.Collections.WebDAVCache
cfg.Cache.cluster = cls
+ cfg.Cache.logger = logger
return &cfg
}
@@ -81,7 +82,7 @@ func configure(logger log.FieldLogger, args []string) *Config {
if err != nil {
log.Fatal(err)
}
- cfg := newConfig(arvCfg)
+ cfg := newConfig(logger, arvCfg)
if *dumpConfig {
out, err := yaml.Marshal(cfg)
diff --git a/services/keep-web/server_test.go b/services/keep-web/server_test.go
index d59229520..54e9ddf37 100644
--- a/services/keep-web/server_test.go
+++ b/services/keep-web/server_test.go
@@ -433,7 +433,7 @@ func (s *IntegrationSuite) SetUpTest(c *check.C) {
ldr.Path = "-"
arvCfg, err := ldr.Load()
c.Check(err, check.IsNil)
- cfg := newConfig(arvCfg)
+ cfg := newConfig(ctxlog.TestLogger(c), arvCfg)
c.Assert(err, check.IsNil)
cfg.Client = arvados.Client{
APIHost: testAPIHost,
diff --git a/services/keep-web/status_test.go b/services/keep-web/status_test.go
index 1b6ad93de..f90f85cd9 100644
--- a/services/keep-web/status_test.go
+++ b/services/keep-web/status_test.go
@@ -11,11 +11,12 @@ import (
"net/url"
"git.arvados.org/arvados.git/sdk/go/arvadostest"
+ "git.arvados.org/arvados.git/sdk/go/ctxlog"
"gopkg.in/check.v1"
)
func (s *UnitSuite) TestStatus(c *check.C) {
- h := handler{Config: newConfig(s.Config)}
+ h := handler{Config: newConfig(ctxlog.TestLogger(c), s.Config)}
u, _ := url.Parse("http://keep-web.example/status.json")
req := &http.Request{
Method: "GET",
commit 38489133d0d3ba3797447272edea7f618cf352df
Author: Tom Clegg <tom at curii.com>
Date: Wed Sep 15 03:21:45 2021 -0400
18051: Fix premature ejection from WebDAV collection cache.
Avoid multiple concurrent cache sweeps.
Arvados-DCO-1.1-Signed-off-by: Tom Clegg <tom at curii.com>
diff --git a/services/keep-web/cache.go b/services/keep-web/cache.go
index a52af8048..16fbd0788 100644
--- a/services/keep-web/cache.go
+++ b/services/keep-web/cache.go
@@ -25,9 +25,11 @@ type cache struct {
metrics cacheMetrics
pdhs *lru.TwoQueueCache
collections *lru.TwoQueueCache
- permissions *lru.TwoQueueCache
sessions *lru.TwoQueueCache
setupOnce sync.Once
+
+ chPruneSessions chan struct{}
+ chPruneCollections chan struct{}
}
type cacheMetrics struct {
@@ -37,7 +39,6 @@ type cacheMetrics struct {
sessionEntries prometheus.Gauge
collectionHits prometheus.Counter
pdhHits prometheus.Counter
- permissionHits prometheus.Counter
sessionHits prometheus.Counter
sessionMisses prometheus.Counter
apiCalls prometheus.Counter
@@ -65,13 +66,6 @@ func (m *cacheMetrics) setup(reg *prometheus.Registry) {
Help: "Number of uuid-to-pdh cache hits.",
})
reg.MustRegister(m.pdhHits)
- m.permissionHits = prometheus.NewCounter(prometheus.CounterOpts{
- Namespace: "arvados",
- Subsystem: "keepweb_collectioncache",
- Name: "permission_hits",
- Help: "Number of targetID-to-permission cache hits.",
- })
- reg.MustRegister(m.permissionHits)
m.apiCalls = prometheus.NewCounter(prometheus.CounterOpts{
Namespace: "arvados",
Subsystem: "keepweb_collectioncache",
@@ -117,8 +111,9 @@ func (m *cacheMetrics) setup(reg *prometheus.Registry) {
}
type cachedPDH struct {
- expire time.Time
- pdh string
+ expire time.Time
+ refresh time.Time
+ pdh string
}
type cachedCollection struct {
@@ -149,10 +144,6 @@ func (c *cache) setup() {
if err != nil {
panic(err)
}
- c.permissions, err = lru.New2Q(c.config.MaxPermissionEntries)
- if err != nil {
- panic(err)
- }
c.sessions, err = lru.New2Q(c.config.MaxSessions)
if err != nil {
panic(err)
@@ -168,6 +159,18 @@ func (c *cache) setup() {
c.updateGauges()
}
}()
+ c.chPruneCollections = make(chan struct{}, 1)
+ go func() {
+ for range c.chPruneCollections {
+ c.pruneCollections()
+ }
+ }()
+ c.chPruneSessions = make(chan struct{}, 1)
+ go func() {
+ for range c.chPruneSessions {
+ c.pruneSessions()
+ }
+ }()
}
func (c *cache) updateGauges() {
@@ -192,19 +195,25 @@ func (c *cache) Update(client *arvados.Client, coll arvados.Collection, fs arvad
}
coll.ManifestText = m
var updated arvados.Collection
- defer c.pdhs.Remove(coll.UUID)
err = client.RequestAndDecode(&updated, "PATCH", "arvados/v1/collections/"+coll.UUID, nil, map[string]interface{}{
"collection": map[string]string{
"manifest_text": coll.ManifestText,
},
})
- if err == nil {
- c.collections.Add(client.AuthToken+"\000"+updated.PortableDataHash, &cachedCollection{
- expire: time.Now().Add(time.Duration(c.config.TTL)),
- collection: &updated,
- })
+ if err != nil {
+ c.pdhs.Remove(coll.UUID)
+ return err
}
- return err
+ c.collections.Add(client.AuthToken+"\000"+updated.PortableDataHash, &cachedCollection{
+ expire: time.Now().Add(time.Duration(c.config.TTL)),
+ collection: &updated,
+ })
+ c.pdhs.Add(coll.UUID, &cachedPDH{
+ expire: time.Now().Add(time.Duration(c.config.TTL)),
+ refresh: time.Now().Add(time.Duration(c.config.UUIDTTL)),
+ pdh: updated.PortableDataHash,
+ })
+ return nil
}
// ResetSession unloads any potentially stale state. Should be called
@@ -246,7 +255,10 @@ func (c *cache) GetSession(token string) (arvados.CustomFileSystem, *cachedSessi
} else {
c.metrics.sessionHits.Inc()
}
- go c.pruneSessions()
+ select {
+ case c.chPruneSessions <- struct{}{}:
+ default:
+ }
fs, _ := sess.fs.Load().(arvados.CustomFileSystem)
if fs != nil && !expired {
return fs, sess, nil
@@ -302,19 +314,7 @@ func (c *cache) Get(arv *arvadosclient.ArvadosClient, targetID string, forceRelo
c.setupOnce.Do(c.setup)
c.metrics.requests.Inc()
- permOK := false
- permKey := arv.ApiToken + "\000" + targetID
- if forceReload {
- } else if ent, cached := c.permissions.Get(permKey); cached {
- ent := ent.(*cachedPermission)
- if ent.expire.Before(time.Now()) {
- c.permissions.Remove(permKey)
- } else {
- permOK = true
- c.metrics.permissionHits.Inc()
- }
- }
-
+ var pdhRefresh bool
var pdh string
if arvadosclient.PDHMatch(targetID) {
pdh = targetID
@@ -324,22 +324,26 @@ func (c *cache) Get(arv *arvadosclient.ArvadosClient, targetID string, forceRelo
c.pdhs.Remove(targetID)
} else {
pdh = ent.pdh
+ pdhRefresh = forceReload || time.Now().After(ent.refresh)
c.metrics.pdhHits.Inc()
}
}
- var collection *arvados.Collection
- if pdh != "" {
- collection = c.lookupCollection(arv.ApiToken + "\000" + pdh)
- }
-
- if collection != nil && permOK {
- return collection, nil
- } else if collection != nil {
- // Ask API for current PDH for this targetID. Most
- // likely, the cached PDH is still correct; if so,
- // _and_ the current token has permission, we can
- // use our cached manifest.
+ if pdh == "" {
+ // UUID->PDH mapping is not cached, might as well get
+ // the whole collection record and be done (below).
+ } else if cached := c.lookupCollection(arv.ApiToken + "\000" + pdh); cached == nil {
+ // PDH->manifest is not cached, might as well get the
+ // whole collection record (below).
+ } else if !pdhRefresh {
+ // We looked up UUID->PDH very recently, and we still
+ // have the manifest for that PDH.
+ return cached, nil
+ } else {
+ // Get current PDH for this UUID (and confirm we still
+ // have read permission). Most likely, the cached PDH
+ // is still correct, in which case we can use our
+ // cached manifest.
c.metrics.apiCalls.Inc()
var current arvados.Collection
err := arv.Get("collections", targetID, selectPDH, ¤t)
@@ -347,47 +351,44 @@ func (c *cache) Get(arv *arvadosclient.ArvadosClient, targetID string, forceRelo
return nil, err
}
if current.PortableDataHash == pdh {
- c.permissions.Add(permKey, &cachedPermission{
- expire: time.Now().Add(time.Duration(c.config.TTL)),
- })
- if pdh != targetID {
- c.pdhs.Add(targetID, &cachedPDH{
- expire: time.Now().Add(time.Duration(c.config.UUIDTTL)),
- pdh: pdh,
- })
- }
- return collection, err
+ // PDH has not changed, cached manifest is
+ // correct.
+ return cached, err
}
- // PDH changed, but now we know we have
- // permission -- and maybe we already have the
- // new PDH in the cache.
- if coll := c.lookupCollection(arv.ApiToken + "\000" + current.PortableDataHash); coll != nil {
- return coll, nil
+ if cached := c.lookupCollection(arv.ApiToken + "\000" + current.PortableDataHash); cached != nil {
+ // PDH changed, and we already have the
+ // manifest for that new PDH.
+ return cached, nil
}
}
- // Collection manifest is not cached.
+ // Either UUID->PDH is not cached, or PDH->manifest is not
+ // cached.
+ var retrieved arvados.Collection
c.metrics.apiCalls.Inc()
- err := arv.Get("collections", targetID, nil, &collection)
+ err := arv.Get("collections", targetID, nil, &retrieved)
if err != nil {
return nil, err
}
exp := time.Now().Add(time.Duration(c.config.TTL))
- c.permissions.Add(permKey, &cachedPermission{
- expire: exp,
- })
- c.pdhs.Add(targetID, &cachedPDH{
- expire: time.Now().Add(time.Duration(c.config.UUIDTTL)),
- pdh: collection.PortableDataHash,
- })
- c.collections.Add(arv.ApiToken+"\000"+collection.PortableDataHash, &cachedCollection{
+ if targetID != retrieved.PortableDataHash {
+ c.pdhs.Add(targetID, &cachedPDH{
+ expire: exp,
+ refresh: time.Now().Add(time.Duration(c.config.UUIDTTL)),
+ pdh: retrieved.PortableDataHash,
+ })
+ }
+ c.collections.Add(arv.ApiToken+"\000"+retrieved.PortableDataHash, &cachedCollection{
expire: exp,
- collection: collection,
+ collection: &retrieved,
})
- if int64(len(collection.ManifestText)) > c.config.MaxCollectionBytes/int64(c.config.MaxCollectionEntries) {
- go c.pruneCollections()
+ if int64(len(retrieved.ManifestText)) > c.config.MaxCollectionBytes/int64(c.config.MaxCollectionEntries) {
+ select {
+ case c.chPruneCollections <- struct{}{}:
+ default:
+ }
}
- return collection, nil
+ return &retrieved, nil
}
// pruneCollections checks the total bytes occupied by manifest_text
diff --git a/services/keep-web/cache_test.go b/services/keep-web/cache_test.go
index 0a0eef6e4..80e00b02a 100644
--- a/services/keep-web/cache_test.go
+++ b/services/keep-web/cache_test.go
@@ -51,7 +51,6 @@ func (s *UnitSuite) TestCache(c *check.C) {
s.checkCacheMetrics(c, cache.registry,
"requests 5",
"hits 4",
- "permission_hits 4",
"pdh_hits 4",
"api_calls 1")
@@ -72,7 +71,6 @@ func (s *UnitSuite) TestCache(c *check.C) {
s.checkCacheMetrics(c, cache.registry,
"requests 6",
"hits 4",
- "permission_hits 4",
"pdh_hits 4",
"api_calls 2")
@@ -85,7 +83,6 @@ func (s *UnitSuite) TestCache(c *check.C) {
s.checkCacheMetrics(c, cache.registry,
"requests 7",
"hits 5",
- "permission_hits 5",
"pdh_hits 4",
"api_calls 2")
@@ -105,7 +102,6 @@ func (s *UnitSuite) TestCache(c *check.C) {
s.checkCacheMetrics(c, cache.registry,
"requests 27",
"hits 23",
- "permission_hits 23",
"pdh_hits 22",
"api_calls 4")
}
@@ -125,9 +121,8 @@ func (s *UnitSuite) TestCacheForceReloadByPDH(c *check.C) {
s.checkCacheMetrics(c, cache.registry,
"requests 4",
"hits 3",
- "permission_hits 1",
"pdh_hits 0",
- "api_calls 3")
+ "api_calls 1")
}
func (s *UnitSuite) TestCacheForceReloadByUUID(c *check.C) {
@@ -145,7 +140,6 @@ func (s *UnitSuite) TestCacheForceReloadByUUID(c *check.C) {
s.checkCacheMetrics(c, cache.registry,
"requests 4",
"hits 3",
- "permission_hits 1",
"pdh_hits 3",
"api_calls 3")
}
diff --git a/services/keep-web/handler_test.go b/services/keep-web/handler_test.go
index e883e806c..a74b85b98 100644
--- a/services/keep-web/handler_test.go
+++ b/services/keep-web/handler_test.go
@@ -1067,7 +1067,7 @@ func (s *IntegrationSuite) TestFileContentType(c *check.C) {
contentType string
}{
{"picture.txt", "BMX bikes are small this year\n", "text/plain; charset=utf-8"},
- {"picture.bmp", "BMX bikes are small this year\n", "image/x-ms-bmp"},
+ {"picture.bmp", "BMX bikes are small this year\n", "image/(x-ms-)?bmp"},
{"picture.jpg", "BMX bikes are small this year\n", "image/jpeg"},
{"picture1", "BMX bikes are small this year\n", "image/bmp"}, // content sniff; "BM" is the magic signature for .bmp
{"picture2", "Cars are small this year\n", "text/plain; charset=utf-8"}, // content sniff
@@ -1103,7 +1103,7 @@ func (s *IntegrationSuite) TestFileContentType(c *check.C) {
resp := httptest.NewRecorder()
s.testServer.Handler.ServeHTTP(resp, req)
c.Check(resp.Code, check.Equals, http.StatusOK)
- c.Check(resp.Header().Get("Content-Type"), check.Equals, trial.contentType)
+ c.Check(resp.Header().Get("Content-Type"), check.Matches, trial.contentType)
c.Check(resp.Body.String(), check.Equals, trial.content)
}
}
diff --git a/services/keep-web/server_test.go b/services/keep-web/server_test.go
index 21d767208..d59229520 100644
--- a/services/keep-web/server_test.go
+++ b/services/keep-web/server_test.go
@@ -393,7 +393,6 @@ func (s *IntegrationSuite) TestMetrics(c *check.C) {
c.Check(counters["arvados_keepweb_collectioncache_api_calls//"].Value, check.Equals, int64(2))
c.Check(counters["arvados_keepweb_collectioncache_hits//"].Value, check.Equals, int64(1))
c.Check(counters["arvados_keepweb_collectioncache_pdh_hits//"].Value, check.Equals, int64(1))
- c.Check(counters["arvados_keepweb_collectioncache_permission_hits//"].Value, check.Equals, int64(1))
c.Check(gauges["arvados_keepweb_collectioncache_cached_manifests//"].Value, check.Equals, float64(1))
// FooCollection's cached manifest size is 45 ("1f4b0....+45") plus one 51-byte blob signature
c.Check(gauges["arvados_keepweb_sessions_cached_collection_bytes//"].Value, check.Equals, float64(45+51))
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