diff --git a/api/client.go b/api/client.go
index 6a2fe2c..f7ca60b 100644
--- a/api/client.go
+++ b/api/client.go
@@ -25,8 +25,6 @@ import (
 	"time"
 )
 
-type Warnings []string
-
 // DefaultRoundTripper is used if no RoundTripper is set in Config.
 var DefaultRoundTripper http.RoundTripper = &http.Transport{
 	Proxy: http.ProxyFromEnvironment,
diff --git a/api/prometheus/v1/api.go b/api/prometheus/v1/api.go
index 9d1345d..06319a8 100644
--- a/api/prometheus/v1/api.go
+++ b/api/prometheus/v1/api.go
@@ -230,15 +230,15 @@ type API interface {
 	// Flags returns the flag values that Prometheus was launched with.
 	Flags(ctx context.Context) (FlagsResult, error)
 	// LabelNames returns all the unique label names present in the block in sorted order.
-	LabelNames(ctx context.Context) ([]string, api.Warnings, error)
+	LabelNames(ctx context.Context) ([]string, Warnings, error)
 	// LabelValues performs a query for the values of the given label.
-	LabelValues(ctx context.Context, label string) (model.LabelValues, api.Warnings, error)
+	LabelValues(ctx context.Context, label string) (model.LabelValues, Warnings, error)
 	// Query performs a query for the given time.
-	Query(ctx context.Context, query string, ts time.Time) (model.Value, api.Warnings, error)
+	Query(ctx context.Context, query string, ts time.Time) (model.Value, Warnings, error)
 	// QueryRange performs a query for the given range.
-	QueryRange(ctx context.Context, query string, r Range) (model.Value, api.Warnings, error)
+	QueryRange(ctx context.Context, query string, r Range) (model.Value, Warnings, error)
 	// Series finds series by label matchers.
-	Series(ctx context.Context, matches []string, startTime time.Time, endTime time.Time) ([]model.LabelSet, api.Warnings, error)
+	Series(ctx context.Context, matches []string, startTime time.Time, endTime time.Time) ([]model.LabelSet, Warnings, error)
 	// Snapshot creates a snapshot of all current data into snapshots/<datetime>-<rand>
 	// under the TSDB's data directory and returns the directory as response.
 	Snapshot(ctx context.Context, skipHead bool) (SnapshotResult, error)
@@ -630,7 +630,7 @@ func (h *httpAPI) Flags(ctx context.Context) (FlagsResult, error) {
 	return res, json.Unmarshal(body, &res)
 }
 
-func (h *httpAPI) LabelNames(ctx context.Context) ([]string, api.Warnings, error) {
+func (h *httpAPI) LabelNames(ctx context.Context) ([]string, Warnings, error) {
 	u := h.client.URL(epLabels, nil)
 	req, err := http.NewRequest(http.MethodGet, u.String(), nil)
 	if err != nil {
@@ -644,7 +644,7 @@ func (h *httpAPI) LabelNames(ctx context.Context) ([]string, api.Warnings, error
 	return labelNames, w, json.Unmarshal(body, &labelNames)
 }
 
-func (h *httpAPI) LabelValues(ctx context.Context, label string) (model.LabelValues, api.Warnings, error) {
+func (h *httpAPI) LabelValues(ctx context.Context, label string) (model.LabelValues, Warnings, error) {
 	u := h.client.URL(epLabelValues, map[string]string{"name": label})
 	req, err := http.NewRequest(http.MethodGet, u.String(), nil)
 	if err != nil {
@@ -658,7 +658,7 @@ func (h *httpAPI) LabelValues(ctx context.Context, label string) (model.LabelVal
 	return labelValues, w, json.Unmarshal(body, &labelValues)
 }
 
-func (h *httpAPI) Query(ctx context.Context, query string, ts time.Time) (model.Value, api.Warnings, error) {
+func (h *httpAPI) Query(ctx context.Context, query string, ts time.Time) (model.Value, Warnings, error) {
 	u := h.client.URL(epQuery, nil)
 	q := u.Query()
 
@@ -676,7 +676,7 @@ func (h *httpAPI) Query(ctx context.Context, query string, ts time.Time) (model.
 	return model.Value(qres.v), warnings, json.Unmarshal(body, &qres)
 }
 
-func (h *httpAPI) QueryRange(ctx context.Context, query string, r Range) (model.Value, api.Warnings, error) {
+func (h *httpAPI) QueryRange(ctx context.Context, query string, r Range) (model.Value, Warnings, error) {
 	u := h.client.URL(epQueryRange, nil)
 	q := u.Query()
 
@@ -695,7 +695,7 @@ func (h *httpAPI) QueryRange(ctx context.Context, query string, r Range) (model.
 	return model.Value(qres.v), warnings, json.Unmarshal(body, &qres)
 }
 
-func (h *httpAPI) Series(ctx context.Context, matches []string, startTime time.Time, endTime time.Time) ([]model.LabelSet, api.Warnings, error) {
+func (h *httpAPI) Series(ctx context.Context, matches []string, startTime time.Time, endTime time.Time) ([]model.LabelSet, Warnings, error) {
 	u := h.client.URL(epSeries, nil)
 	q := u.Query()
 
@@ -802,12 +802,15 @@ func (h *httpAPI) TargetsMetadata(ctx context.Context, matchTarget string, metri
 	return res, json.Unmarshal(body, &res)
 }
 
+// Warnings is an array of non critical errors
+type Warnings []string
+
 // apiClient wraps a regular client and processes successful API responses.
 // Successful also includes responses that errored at the API level.
 type apiClient interface {
 	URL(ep string, args map[string]string) *url.URL
-	Do(context.Context, *http.Request) (*http.Response, []byte, api.Warnings, error)
-	DoGetFallback(ctx context.Context, u *url.URL, args url.Values) (*http.Response, []byte, api.Warnings, error)
+	Do(context.Context, *http.Request) (*http.Response, []byte, Warnings, error)
+	DoGetFallback(ctx context.Context, u *url.URL, args url.Values) (*http.Response, []byte, Warnings, error)
 }
 
 type apiClientImpl struct {
@@ -841,7 +844,7 @@ func (h *apiClientImpl) URL(ep string, args map[string]string) *url.URL {
 	return h.client.URL(ep, args)
 }
 
-func (h *apiClientImpl) Do(ctx context.Context, req *http.Request) (*http.Response, []byte, api.Warnings, error) {
+func (h *apiClientImpl) Do(ctx context.Context, req *http.Request) (*http.Response, []byte, Warnings, error) {
 	resp, body, err := h.client.Do(ctx, req)
 	if err != nil {
 		return resp, body, nil, err
@@ -888,7 +891,7 @@ func (h *apiClientImpl) Do(ctx context.Context, req *http.Request) (*http.Respon
 }
 
 // DoGetFallback will attempt to do the request as-is, and on a 405 it will fallback to a GET request.
-func (h *apiClientImpl) DoGetFallback(ctx context.Context, u *url.URL, args url.Values) (*http.Response, []byte, api.Warnings, error) {
+func (h *apiClientImpl) DoGetFallback(ctx context.Context, u *url.URL, args url.Values) (*http.Response, []byte, Warnings, error) {
 	req, err := http.NewRequest(http.MethodPost, u.String(), strings.NewReader(args.Encode()))
 	if err != nil {
 		return nil, nil, nil, err
diff --git a/api/prometheus/v1/api_test.go b/api/prometheus/v1/api_test.go
index d872834..b43318e 100644
--- a/api/prometheus/v1/api_test.go
+++ b/api/prometheus/v1/api_test.go
@@ -30,12 +30,10 @@ import (
 	json "github.com/json-iterator/go"
 
 	"github.com/prometheus/common/model"
-
-	"github.com/prometheus/client_golang/api"
 )
 
 type apiTest struct {
-	do           func() (interface{}, api.Warnings, error)
+	do           func() (interface{}, Warnings, error)
 	inWarnings   []string
 	inErr        error
 	inStatusCode int
@@ -45,7 +43,7 @@ type apiTest struct {
 	reqParam  url.Values
 	reqMethod string
 	res       interface{}
-	warnings  api.Warnings
+	warnings  Warnings
 	err       error
 }
 
@@ -66,7 +64,7 @@ func (c *apiTestClient) URL(ep string, args map[string]string) *url.URL {
 	return u
 }
 
-func (c *apiTestClient) Do(ctx context.Context, req *http.Request) (*http.Response, []byte, api.Warnings, error) {
+func (c *apiTestClient) Do(ctx context.Context, req *http.Request) (*http.Response, []byte, Warnings, error) {
 
 	test := c.curTest
 
@@ -94,7 +92,7 @@ func (c *apiTestClient) Do(ctx context.Context, req *http.Request) (*http.Respon
 	return resp, b, test.inWarnings, test.inErr
 }
 
-func (c *apiTestClient) DoGetFallback(ctx context.Context, u *url.URL, args url.Values) (*http.Response, []byte, api.Warnings, error) {
+func (c *apiTestClient) DoGetFallback(ctx context.Context, u *url.URL, args url.Values) (*http.Response, []byte, Warnings, error) {
 	req, err := http.NewRequest(http.MethodPost, u.String(), strings.NewReader(args.Encode()))
 	if err != nil {
 		return nil, nil, nil, err
@@ -113,92 +111,92 @@ func TestAPIs(t *testing.T) {
 		client: tc,
 	}
 
-	doAlertManagers := func() func() (interface{}, api.Warnings, error) {
-		return func() (interface{}, api.Warnings, error) {
+	doAlertManagers := func() func() (interface{}, Warnings, error) {
+		return func() (interface{}, Warnings, error) {
 			v, err := promAPI.AlertManagers(context.Background())
 			return v, nil, err
 		}
 	}
 
-	doCleanTombstones := func() func() (interface{}, api.Warnings, error) {
-		return func() (interface{}, api.Warnings, error) {
+	doCleanTombstones := func() func() (interface{}, Warnings, error) {
+		return func() (interface{}, Warnings, error) {
 			return nil, nil, promAPI.CleanTombstones(context.Background())
 		}
 	}
 
-	doConfig := func() func() (interface{}, api.Warnings, error) {
-		return func() (interface{}, api.Warnings, error) {
+	doConfig := func() func() (interface{}, Warnings, error) {
+		return func() (interface{}, Warnings, error) {
 			v, err := promAPI.Config(context.Background())
 			return v, nil, err
 		}
 	}
 
-	doDeleteSeries := func(matcher string, startTime time.Time, endTime time.Time) func() (interface{}, api.Warnings, error) {
-		return func() (interface{}, api.Warnings, error) {
+	doDeleteSeries := func(matcher string, startTime time.Time, endTime time.Time) func() (interface{}, Warnings, error) {
+		return func() (interface{}, Warnings, error) {
 			return nil, nil, promAPI.DeleteSeries(context.Background(), []string{matcher}, startTime, endTime)
 		}
 	}
 
-	doFlags := func() func() (interface{}, api.Warnings, error) {
-		return func() (interface{}, api.Warnings, error) {
+	doFlags := func() func() (interface{}, Warnings, error) {
+		return func() (interface{}, Warnings, error) {
 			v, err := promAPI.Flags(context.Background())
 			return v, nil, err
 		}
 	}
 
-	doLabelNames := func(label string) func() (interface{}, api.Warnings, error) {
-		return func() (interface{}, api.Warnings, error) {
+	doLabelNames := func(label string) func() (interface{}, Warnings, error) {
+		return func() (interface{}, Warnings, error) {
 			return promAPI.LabelNames(context.Background())
 		}
 	}
 
-	doLabelValues := func(label string) func() (interface{}, api.Warnings, error) {
-		return func() (interface{}, api.Warnings, error) {
+	doLabelValues := func(label string) func() (interface{}, Warnings, error) {
+		return func() (interface{}, Warnings, error) {
 			return promAPI.LabelValues(context.Background(), label)
 		}
 	}
 
-	doQuery := func(q string, ts time.Time) func() (interface{}, api.Warnings, error) {
-		return func() (interface{}, api.Warnings, error) {
+	doQuery := func(q string, ts time.Time) func() (interface{}, Warnings, error) {
+		return func() (interface{}, Warnings, error) {
 			return promAPI.Query(context.Background(), q, ts)
 		}
 	}
 
-	doQueryRange := func(q string, rng Range) func() (interface{}, api.Warnings, error) {
-		return func() (interface{}, api.Warnings, error) {
+	doQueryRange := func(q string, rng Range) func() (interface{}, Warnings, error) {
+		return func() (interface{}, Warnings, error) {
 			return promAPI.QueryRange(context.Background(), q, rng)
 		}
 	}
 
-	doSeries := func(matcher string, startTime time.Time, endTime time.Time) func() (interface{}, api.Warnings, error) {
-		return func() (interface{}, api.Warnings, error) {
+	doSeries := func(matcher string, startTime time.Time, endTime time.Time) func() (interface{}, Warnings, error) {
+		return func() (interface{}, Warnings, error) {
 			return promAPI.Series(context.Background(), []string{matcher}, startTime, endTime)
 		}
 	}
 
-	doSnapshot := func(skipHead bool) func() (interface{}, api.Warnings, error) {
-		return func() (interface{}, api.Warnings, error) {
+	doSnapshot := func(skipHead bool) func() (interface{}, Warnings, error) {
+		return func() (interface{}, Warnings, error) {
 			v, err := promAPI.Snapshot(context.Background(), skipHead)
 			return v, nil, err
 		}
 	}
 
-	doRules := func() func() (interface{}, api.Warnings, error) {
-		return func() (interface{}, api.Warnings, error) {
+	doRules := func() func() (interface{}, Warnings, error) {
+		return func() (interface{}, Warnings, error) {
 			v, err := promAPI.Rules(context.Background())
 			return v, nil, err
 		}
 	}
 
-	doTargets := func() func() (interface{}, api.Warnings, error) {
-		return func() (interface{}, api.Warnings, error) {
+	doTargets := func() func() (interface{}, Warnings, error) {
+		return func() (interface{}, Warnings, error) {
 			v, err := promAPI.Targets(context.Background())
 			return v, nil, err
 		}
 	}
 
-	doTargetsMetadata := func(matchTarget string, metric string, limit string) func() (interface{}, api.Warnings, error) {
-		return func() (interface{}, api.Warnings, error) {
+	doTargetsMetadata := func(matchTarget string, metric string, limit string) func() (interface{}, Warnings, error) {
+		return func() (interface{}, Warnings, error) {
 			v, err := promAPI.TargetsMetadata(context.Background(), matchTarget, metric, limit)
 			return v, nil, err
 		}
@@ -911,7 +909,7 @@ type apiClientTest struct {
 	response         interface{}
 	expectedBody     string
 	expectedErr      *Error
-	expectedWarnings api.Warnings
+	expectedWarnings Warnings
 }
 
 func (c *testClient) URL(ep string, args map[string]string) *url.URL {