re-add custom histogram buckets for #92

src/dns_exporter/metrics.py

@@ -12,6 +12,7 @@
     Histogram,
     Info,
 )
+from prometheus_client.utils import INF
 
 from dns_exporter.version import __version__
 
@@ -227,6 +228,32 @@ def get_dns_failure_metric() -> CounterMetricFamily:
     name="dnsexp_dns_responsetime_seconds",
     documentation="DNS query response timing histogram. This histogram is updated every time the dns_exporter receives a query response.",  # noqa: E501
     labelnames=QTIME_LABELS,
+    buckets=(
+        1.0,
+        2.0,
+        4.0,
+        8.0,
+        16.0,
+        32.0,
+        64.0,
+        128.0,
+        256.0,  # 4 minutes
+        512.0,  # 8 minutes
+        1024.0,  # 17 minutes
+        2048.0,  # 34 minutes
+        4096.0,  # 1 hour 8 minutes
+        8192.0,  # 2 hours 16 minutes
+        16384.0,  # 4.5 hours
+        32768.0,  # 9.1 hours
+        65536.0,  # 18.2 hours
+        131072.0,  # 36.4 hours
+        262144.0,  # 72.8 hours
+        524288.0,  # 6 days
+        1048576.0,  # 12 days
+        2097152.0,  # 24 days
+        4194304.0,  # 48 days
+        INF,
+    ),
 )
 """``dnsexp_dns_responsetime_seconds`` is the Histogram keeping track of how many DNS responses this exporter
 received since start and how long the query took.

src/tests/test_exporter.py

@@ -271,7 +271,7 @@ def test_internal_metrics(dns_exporter_example_config, caplog):
 dnsexp_http_responses_total{path="/query",response_code="200"} 75.0
 dnsexp_http_responses_total{path="/",response_code="200"} 1.0
 dnsexp_dns_queries_total 61.0
-dnsexp_dns_responsetime_seconds_bucket{additional="0",answer="1",authority="0",family="ipv4",flags="QR RA RD",ip="8.8.4.4",le="0.005",nsid="no_nsid",opcode="QUERY",port="53",protocol="udp",proxy="none",query_name="example.com",query_type="A",rcode="NOERROR",server="udp://dns.google:53",transport="UDP"}
+dnsexp_dns_responsetime_seconds_bucket{additional="0",answer="1",authority="0",family="ipv4",flags="QR RA RD",ip="8.8.4.4",le="2.0",nsid="no_nsid",opcode="QUERY",port="53",protocol="udp",proxy="none",query_name="example.com",query_type="A",rcode="NOERROR",server="udp://dns.google:53",transport="UDP"}
 dnsexp_scrape_failures_total{reason="certificate_error"} 4.0
 dnsexp_scrape_failures_total{reason="invalid_request_config"} 7.0
 dnsexp_scrape_failures_total{reason="invalid_request_proxy"} 2.0