p2.7: prometheus /metrics

Default GET /metrics is Prometheus text; JSON stays at /metrics.json
and ?format=json. :8443 needs the metrics caller bearer; loopback
stays open. Restricted callers have no per-caller series and no
tavily:restricted gauge.

vendor/github.com/prometheus/procfs/Makefile

@@ -0,0 +1,31 @@
+# Copyright The Prometheus Authors
+# Licensed 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.
+
+include Makefile.common
+
+%/.unpacked: %.ttar
+	@echo ">> extracting fixtures $*"
+	./ttar -C $(dir $*) -x -f $*.ttar
+	touch $@
+
+fixtures: testdata/fixtures/.unpacked
+
+update_fixtures:
+	rm -vf testdata/fixtures/.unpacked
+	./ttar -c -f testdata/fixtures.ttar -C testdata/ fixtures/
+
+.PHONY: build
+build:
+
+.PHONY: test
+test: testdata/fixtures/.unpacked common-test