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<p>我想从Prometheus HTTP服务器获取某个度量:<code>zcash_difficulty_gauge</code>,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</p>
<p>我的代码:</p>
<pre><code>query = "http://localhost:8094/api/v1/query\?query\=zcash_difficulty_gauge"
response = requests.get(query)
</code></pre>
<p>然后,我将面临以下命令的JSON错误:</p>
<pre><code>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)
</code></pre>
<p>即使我尝试了<code>curl</code>命令:</p>
<pre><code>curl http://localhost:8094/api/v1/query\?query\=zcash_difficulty_gauge
</code></pre>
<p>我得到的回报是整个页面,而不仅仅是我想要的指标</p>
<p>URL:<code>localhost:8094</code>是整个页面,如下所示:</p>
<pre><code># 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
</code></pre>
<p>我的服务器脚本是:</p>
<pre><code>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
</code></pre>
<p>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<a href="https://stackoverflow.com/questions/60050507/reading-prometheus-metric-using-python">another similar post</a>所说的话,但解决办法似乎与我现在正在做的事情相符</p>
<p>如何使用Python获取特定度量</p>