我想从Prometheus HTTP服务器获取某个度量:zcash_difficulty_gauge
,但我面临以下错误:I)JSON不可用ii)请求URL不返回度量,而是返回整个度量页面
我的代码:
query = "http://localhost:8094/api/v1/query\?query\=zcash_difficulty_gauge"
response = requests.get(query)
然后,我将面临以下命令的JSON错误:
In [39]: response.json()
---------------------------------------------------------------------------
JSONDecodeError Traceback (most recent call last)
<ipython-input-39-34c975fa6377> in <module>
----> 1 response.json()
~/workspace/source/graphstore/k8s/gcp/neo4j/venv/lib/python3.8/site-packages/requests/models.py in json(self, **kwargs)
908 # used.
909 pass
--> 910 return complexjson.loads(self.text, **kwargs)
911
912 @property
/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.8/lib/python3.8/json/__init__.py in loads(s, cls, object_hook, parse_float, parse_int, parse_constant, object_pairs_hook, **kw)
355 parse_int is None and parse_float is None and
356 parse_constant is None and object_pairs_hook is None and not kw):
--> 357 return _default_decoder.decode(s)
358 if cls is None:
359 cls = JSONDecoder
/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.8/lib/python3.8/json/decoder.py in decode(self, s, _w)
335
336 """
--> 337 obj, end = self.raw_decode(s, idx=_w(s, 0).end())
338 end = _w(s, end).end()
339 if end != len(s):
/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.8/lib/python3.8/json/decoder.py in raw_decode(self, s, idx)
353 obj, end = self.scan_once(s, idx)
354 except StopIteration as err:
--> 355 raise JSONDecodeError("Expecting value", s, err.value) from None
356 return obj, end
JSONDecodeError: Expecting value: line 1 column 1 (char 0)
即使我尝试了curl
命令:
curl http://localhost:8094/api/v1/query\?query\=zcash_difficulty_gauge
我得到的回报是整个页面,而不仅仅是我想要的指标
URL:localhost:8094
是整个页面,如下所示:
# HELP python_gc_objects_collected_total Objects collected during gc
# TYPE python_gc_objects_collected_total counter
python_gc_objects_collected_total{generation="0"} 314.0
python_gc_objects_collected_total{generation="1"} 58.0
python_gc_objects_collected_total{generation="2"} 0.0
# HELP python_gc_objects_uncollectable_total Uncollectable object found during GC
# TYPE python_gc_objects_uncollectable_total counter
python_gc_objects_uncollectable_total{generation="0"} 0.0
python_gc_objects_uncollectable_total{generation="1"} 0.0
python_gc_objects_uncollectable_total{generation="2"} 0.0
# HELP python_gc_collections_total Number of times this generation was collected
# TYPE python_gc_collections_total counter
python_gc_collections_total{generation="0"} 36.0
python_gc_collections_total{generation="1"} 3.0
python_gc_collections_total{generation="2"} 0.0
# HELP python_info Python platform information
# TYPE python_info gauge
python_info{implementation="CPython",major="3",minor="8",patchlevel="2",version="3.8.2"} 1.0
# HELP zcash_difficulty_gauge zcash_difficulty_gauge gauge
# TYPE zcash_difficulty_gauge gauge
zcash_difficulty_gauge 1237.0
我的服务器脚本是:
from typing import Counter
from prometheus_client import start_http_server, Gauge
from time import sleep
start_http_server(8094)
ZCASH_DIFFICULTY_GAUGE = Gauge('zcash_difficulty_gauge', 'zcash_difficulty_gauge gauge')
counter = 0
while True:
sleep(10)
ZCASH_DIFFICULTY_GAUGE.set(1004 + counter)
counter += 1
我试过阅读这些文件,但似乎我在这些文件的基础上做了正确的事情。我还试图理解another similar post所说的话,但解决办法似乎与我现在正在做的事情相符
如何使用Python获取特定度量
这里似乎有一些关于端点的混淆
http://localhost:8094
不是prometheus,它是由脚本启动的HTTP服务器(在start_http_server(8094)
行中)。它没有“API”;它只是发布了一个指标列表普罗米修斯会用一个粗略的工作来收集这些指标
普罗米修斯通常监听端口9090,尽管这是可以更改的。如果您已经配置了适当的刮取作业,并且如果普罗米修斯在
localhost:9090
公开,则以下curl
命令将查询普罗米修斯以获取您的目标度量:有一个text formatter provided by Prometheus client解决了这个问题。它加载所有文本度量,您可以使用它们创建字典和JSON
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