diff --git a/apisix/plugins/prometheus/exporter.lua b/apisix/plugins/prometheus/exporter.lua
index 50736241bc28..c15c5d081b70 100644
--- a/apisix/plugins/prometheus/exporter.lua
+++ b/apisix/plugins/prometheus/exporter.lua
@@ -473,6 +473,7 @@ local function collect(ctx, stream_only)
 
     -- update upstream_status metrics
     local stats = control.get_health_checkers()
+    metrics.upstream_status:reset()
     for _, stat in ipairs(stats) do
         for _, node in ipairs(stat.nodes) do
             metrics.upstream_status:set(
diff --git a/t/node/healthcheck-metric.t b/t/node/healthcheck-metric.t
new file mode 100644
index 000000000000..7a7d2f9932ff
--- /dev/null
+++ b/t/node/healthcheck-metric.t
@@ -0,0 +1,508 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+use t::APISIX 'no_plan';
+
+no_root_location();
+repeat_each(1);
+log_level('debug');
+no_root_location();
+no_shuffle();
+
+add_block_preprocessor(sub {
+    my ($block) = @_;
+
+    if (!$block->http_config) {
+        my $http_config = <<'_EOC_';
+server {
+    listen 8765;
+
+    location /ping {
+        return 200 '8765';
+    }
+
+    location /healthz {
+        return 200 'ok';
+    }
+}
+
+server {
+    listen 8766;
+
+    location /ping {
+        return 200 '8766';
+    }
+
+    location /healthz {
+        return 200 'ok';
+    }
+}
+
+
+server {
+    listen 8767;
+    location /ping {
+        return 200 '8767';
+    }
+
+    location /healthz {
+        return 200 'ok';
+    }
+}
+
+_EOC_
+        $block->set_value("http_config", $http_config);
+    }
+
+    if (!$block->request) {
+        $block->set_value("request", "GET /t");
+    }
+
+});
+
+run_tests;
+
+__DATA__
+
+=== TEST 1: enable metrics uri
+--- config
+    location /t {
+        content_by_lua_block {
+            local t = require("lib.test_admin")
+            local core = require("apisix.core")
+
+            -- enable prometheus
+            local metric_data = {
+                uri = "/apisix/prometheus/metrics",
+                plugins = {
+                    ["public-api"] = {}
+                }
+            }
+
+            local code, body = t.test('/apisix/admin/routes/metrics',
+                ngx.HTTP_PUT, core.json.encode(metric_data))
+            ngx.say(body)
+        }
+    }
+--- request
+GET /t
+--- response_body
+passed
+
+
+
+=== TEST 2: to reduce one upstream node, the metric should also be reduced by one.
+--- extra_init_worker_by_lua
+    local healthcheck = require("resty.healthcheck")
+    local new = healthcheck.new
+    healthcheck.new = function(...)
+        local obj = new(...)
+        local clear = obj.delayed_clear
+        obj.delayed_clear = obj.clear
+        return obj
+    end
+--- config
+    location /t {
+        content_by_lua_block {
+            local core = require("apisix.core")
+            local t = require("lib.test_admin")
+            local http = require("resty.http")
+
+            local function find_apisix_upstream_status(multiLineStr)
+                local pattern = "(apisix_upstream_status{.-)$"
+                local result = {}
+                for line in multiLineStr:gmatch("[^\r\n]+") do
+                    local match = line:match(pattern)
+                    if match then
+                        table.insert(result, match)
+                    end
+                end
+                return result
+            end
+
+            --- get the metrics
+            local function get_metrics()
+                local httpc = http.new()
+                local metric_uri = "http://127.0.0.1:" .. ngx.var.server_port .. "/apisix/prometheus/metrics"
+                local metric_res, err = httpc:request_uri(metric_uri, {method = "GET"})
+                if err then
+                    ngx.say("failed to request: ", err)
+                    return
+                end
+                local apisix_upstream_status_body = find_apisix_upstream_status(metric_res.body)
+                for _, match in ipairs(apisix_upstream_status_body) do
+                    ngx.say(match)
+                end
+            end
+
+            -- create a route
+            local data = {
+                uri = "/ping",
+                upstream = {
+                    nodes = {
+                        ["127.0.0.1:8765"] = 1,
+                        ["127.0.0.1:8766"] = 1,
+                        ["127.0.0.1:8767"] = 1
+                    },
+                    retries = 2,
+                    checks = {
+                        active = {
+                            http_path = "/healthz",
+                            healthy = {
+                                interval = 1,
+                                successes = 1
+                            },
+                            unhealthy = {
+                                interval = 1,
+                                http_failures = 1
+                            },
+                        }
+                    }
+                }
+            }
+            local code, body = t.test('/apisix/admin/routes/1',
+                ngx.HTTP_PUT, core.json.encode(data))
+            if code >= 300 then
+                ngx.status = code
+                ngx.say(body)
+                return
+            end
+
+            local httpc = http.new()
+            local uri = "http://127.0.0.1:" .. ngx.var.server_port .. "/ping"
+            local _, _ = httpc:request_uri(uri, {method = "GET", keepalive = false})
+
+            --- get metrics
+            get_metrics()
+
+            ngx.say("update the upstream")
+
+            --- update the route
+            local new_data = {
+                uri = "/ping",
+                upstream = {
+                    nodes = {
+                        ["127.0.0.1:8765"] = 1,
+                        ["127.0.0.1:8766"] = 1
+                    },
+                    retries = 2,
+                    checks = {
+                        active = {
+                            http_path = "/healthz",
+                            healthy = {
+                                interval = 1,
+                                successes = 1
+                            },
+                            unhealthy = {
+                                interval = 1,
+                                http_failures = 1
+                            },
+                        }
+                    }
+                }
+            }
+            local code, body = t.test('/apisix/admin/routes/1',
+                ngx.HTTP_PUT, core.json.encode(new_data))
+            if code >= 300 then
+                ngx.status = code
+                ngx.say(body)
+                return
+            end
+
+            local http = require("resty.http")
+            local httpc = http.new()
+            local uri = "http://127.0.0.1:" .. ngx.var.server_port .. "/ping"
+            local _, _ = httpc:request_uri(uri, {method = "GET", keepalive = false})
+
+            --- get metrics
+            get_metrics()
+        }
+    }
+--- request
+GET /t
+--- grep_error_log eval
+qr/create new checker: table: 0x|try to release checker: table: 0x|event: target added '127.0.0.1\(127.0.0.1:8767.*/
+--- grep_error_log_out
+create new checker: table: 0x
+event: target added '127.0.0.1(127.0.0.1:8767)'
+try to release checker: table: 0x
+create new checker: table: 0x
+--- response_body
+apisix_upstream_status{name="/apisix/routes/1",ip="127.0.0.1",port="8765"} 1
+apisix_upstream_status{name="/apisix/routes/1",ip="127.0.0.1",port="8766"} 1
+apisix_upstream_status{name="/apisix/routes/1",ip="127.0.0.1",port="8767"} 1
+update the upstream
+apisix_upstream_status{name="/apisix/routes/1",ip="127.0.0.1",port="8765"} 1
+apisix_upstream_status{name="/apisix/routes/1",ip="127.0.0.1",port="8766"} 1
+
+
+
+=== TEST 3: add an upstream node, and metric should also be added.
+--- extra_init_worker_by_lua
+    local healthcheck = require("resty.healthcheck")
+    local new = healthcheck.new
+    healthcheck.new = function(...)
+        local obj = new(...)
+        local clear = obj.delayed_clear
+        obj.delayed_clear = obj.clear
+        return obj
+    end
+--- config
+    location /t {
+        content_by_lua_block {
+            local core = require("apisix.core")
+            local t = require("lib.test_admin")
+            local http = require("resty.http")
+
+            local function find_apisix_upstream_status(multiLineStr)
+                local pattern = "(apisix_upstream_status{.-)$"
+                local result = {}
+                for line in multiLineStr:gmatch("[^\r\n]+") do
+                    local match = line:match(pattern)
+                    if match then
+                        table.insert(result, match)
+                    end
+                end
+                return result
+            end
+
+            --- get the metrics
+            local function get_metrics()
+                local httpc = http.new()
+                local metric_uri = "http://127.0.0.1:" .. ngx.var.server_port .. "/apisix/prometheus/metrics"
+                local metric_res, err = httpc:request_uri(metric_uri, {method = "GET"})
+                if err then
+                    ngx.say("failed to request: ", err)
+                    return
+                end
+                local apisix_upstream_status_body = find_apisix_upstream_status(metric_res.body)
+                for _, match in ipairs(apisix_upstream_status_body) do
+                    ngx.say(match)
+                end
+            end
+
+            -- create a route
+            local data = {
+                uri = "/ping",
+                upstream = {
+                    nodes = {
+                        ["127.0.0.1:8765"] = 1,
+                        ["127.0.0.1:8766"] = 1
+                    },
+                    retries = 2,
+                    checks = {
+                        active = {
+                            http_path = "/healthz",
+                            healthy = {
+                                interval = 1,
+                                successes = 1
+                            },
+                            unhealthy = {
+                                interval = 1,
+                                http_failures = 1
+                            },
+                        }
+                    }
+                }
+            }
+            local code, body = t.test('/apisix/admin/routes/1',
+                ngx.HTTP_PUT, core.json.encode(data))
+            if code >= 300 then
+                ngx.status = code
+                ngx.say(body)
+                return
+            end
+
+            local httpc = http.new()
+            local uri = "http://127.0.0.1:" .. ngx.var.server_port .. "/ping"
+            local _, _ = httpc:request_uri(uri, {method = "GET", keepalive = false})
+
+            --- get metrics
+            get_metrics()
+
+            ngx.say("update the upstream")
+
+            --- update the route
+            local new_data = {
+                uri = "/ping",
+                upstream = {
+                    nodes = {
+                        ["127.0.0.1:8765"] = 1,
+                        ["127.0.0.1:8766"] = 1,
+                        ["127.0.0.1:8767"] = 1
+                    },
+                    retries = 2,
+                    checks = {
+                        active = {
+                            http_path = "/healthz",
+                            healthy = {
+                                interval = 1,
+                                successes = 1
+                            },
+                            unhealthy = {
+                                interval = 1,
+                                http_failures = 1
+                            },
+                        }
+                    }
+                }
+            }
+            local code, body = t.test('/apisix/admin/routes/1',
+                ngx.HTTP_PUT, core.json.encode(new_data))
+            if code >= 300 then
+                ngx.status = code
+                ngx.say(body)
+                return
+            end
+
+            local http = require("resty.http")
+            local httpc = http.new()
+            local uri = "http://127.0.0.1:" .. ngx.var.server_port .. "/ping"
+            local _, _ = httpc:request_uri(uri, {method = "GET", keepalive = false})
+
+            --- get metrics
+            get_metrics()
+        }
+    }
+--- request
+GET /t
+--- grep_error_log eval
+qr/create new checker: table: 0x|try to release checker: table: 0x|event: target added '127.0.0.1\(127.0.0.1:8767.*/
+--- grep_error_log_out
+create new checker: table: 0x
+try to release checker: table: 0x
+create new checker: table: 0x
+event: target added '127.0.0.1(127.0.0.1:8767)'
+--- response_body
+apisix_upstream_status{name="/apisix/routes/1",ip="127.0.0.1",port="8765"} 1
+apisix_upstream_status{name="/apisix/routes/1",ip="127.0.0.1",port="8766"} 1
+update the upstream
+apisix_upstream_status{name="/apisix/routes/1",ip="127.0.0.1",port="8765"} 1
+apisix_upstream_status{name="/apisix/routes/1",ip="127.0.0.1",port="8766"} 1
+apisix_upstream_status{name="/apisix/routes/1",ip="127.0.0.1",port="8767"} 1
+
+
+
+=== TEST 4: delete the route
+--- extra_init_worker_by_lua
+    local healthcheck = require("resty.healthcheck")
+    local new = healthcheck.new
+    healthcheck.new = function(...)
+        local obj = new(...)
+        local clear = obj.delayed_clear
+        obj.delayed_clear = obj.clear
+        return obj
+    end
+--- config
+    location /t {
+        content_by_lua_block {
+            local core = require("apisix.core")
+            local t = require("lib.test_admin")
+            local http = require("resty.http")
+
+            local function find_apisix_upstream_status(multiLineStr)
+                local pattern = "(apisix_upstream_status{.-)$"
+                local result = {}
+                for line in multiLineStr:gmatch("[^\r\n]+") do
+                    local match = line:match(pattern)
+                    if match then
+                        table.insert(result, match)
+                    end
+                end
+                return result
+            end
+
+            --- get the metrics
+            local function get_metrics()
+                local httpc = http.new()
+                local metric_uri = "http://127.0.0.1:" .. ngx.var.server_port .. "/apisix/prometheus/metrics"
+                local metric_res, err = httpc:request_uri(metric_uri, {method = "GET"})
+                if err then
+                    ngx.say("failed to request: ", err)
+                    return
+                end
+                local apisix_upstream_status_body = find_apisix_upstream_status(metric_res.body)
+                for _, match in ipairs(apisix_upstream_status_body) do
+                    ngx.say(match)
+                end
+            end
+
+            -- create a route
+            local data = {
+                uri = "/ping",
+                upstream = {
+                    nodes = {
+                        ["127.0.0.1:8765"] = 1,
+                        ["127.0.0.1:8766"] = 1
+                    },
+                    retries = 2,
+                    checks = {
+                        active = {
+                            http_path = "/healthz",
+                            healthy = {
+                                interval = 1,
+                                successes = 1
+                            },
+                            unhealthy = {
+                                interval = 1,
+                                http_failures = 1
+                            },
+                        }
+                    }
+                }
+            }
+            local code, body = t.test('/apisix/admin/routes/1',
+                ngx.HTTP_PUT, core.json.encode(data))
+            if code >= 300 then
+                ngx.status = code
+                ngx.say(body)
+                return
+            end
+
+            local httpc = http.new()
+            local uri = "http://127.0.0.1:" .. ngx.var.server_port .. "/ping"
+            local _, _ = httpc:request_uri(uri, {method = "GET", keepalive = false})
+
+            --- get metrics
+            get_metrics()
+
+            --- delete the route
+            local code, body = t.test('/apisix/admin/routes/1', ngx.HTTP_DELETE)
+            if code >= 300 then
+                ngx.status = code
+                ngx.say(body)
+                return
+            end
+
+            local http = require("resty.http")
+            local httpc = http.new()
+            local uri = "http://127.0.0.1:" .. ngx.var.server_port .. "/ping"
+            local _, _ = httpc:request_uri(uri, {method = "GET", keepalive = false})
+
+            --- get metrics
+            get_metrics()
+        }
+    }
+--- request
+GET /t
+--- grep_error_log eval
+qr/create new checker: table: 0x|try to release checker: table: 0x/
+--- grep_error_log_out
+create new checker: table: 0x
+try to release checker: table: 0x
+--- response_body
+apisix_upstream_status{name="/apisix/routes/1",ip="127.0.0.1",port="8765"} 1
+apisix_upstream_status{name="/apisix/routes/1",ip="127.0.0.1",port="8766"} 1