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/modules.txt

@@ -18,6 +18,12 @@ github.com/andybalholm/cascadia
 # github.com/araddon/dateparse v0.0.0-20210429162001-6b43995a97de
 ## explicit; go 1.12
 github.com/araddon/dateparse
+# github.com/beorn7/perks v1.0.1
+## explicit; go 1.11
+github.com/beorn7/perks/quantile
+# github.com/cespare/xxhash/v2 v2.3.0
+## explicit; go 1.11
+github.com/cespare/xxhash/v2
 # github.com/dustin/go-humanize v1.0.1
 ## explicit; go 1.16
 github.com/dustin/go-humanize
@@ -43,6 +49,9 @@ github.com/itchyny/timefmt-go
 # github.com/mattn/go-isatty v0.0.24
 ## explicit; go 1.20
 github.com/mattn/go-isatty
+# github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822
+## explicit
+github.com/munnerz/goautoneg
 # github.com/ncruces/go-strftime v1.0.0
 ## explicit; go 1.17
 github.com/ncruces/go-strftime
@@ -52,6 +61,26 @@ github.com/pelletier/go-toml/v2
 github.com/pelletier/go-toml/v2/internal/parserbridge
 github.com/pelletier/go-toml/v2/internal/tracker
 github.com/pelletier/go-toml/v2/unstable
+# github.com/prometheus/client_golang v1.24.1
+## explicit; go 1.25.0
+github.com/prometheus/client_golang/internal/github.com/golang/gddo/httputil
+github.com/prometheus/client_golang/internal/github.com/golang/gddo/httputil/header
+github.com/prometheus/client_golang/prometheus
+github.com/prometheus/client_golang/prometheus/internal
+github.com/prometheus/client_golang/prometheus/promhttp
+github.com/prometheus/client_golang/prometheus/promhttp/internal
+# github.com/prometheus/client_model v0.6.3
+## explicit; go 1.23
+github.com/prometheus/client_model/go
+# github.com/prometheus/common v0.71.0
+## explicit; go 1.25.0
+github.com/prometheus/common/expfmt
+github.com/prometheus/common/model
+# github.com/prometheus/procfs v0.21.1
+## explicit; go 1.25.0
+github.com/prometheus/procfs
+github.com/prometheus/procfs/internal/fs
+github.com/prometheus/procfs/internal/util
 # github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec
 ## explicit; go 1.12
 github.com/remyoudompheng/bigfft
@@ -84,6 +113,37 @@ golang.org/x/text/language
 golang.org/x/text/runes
 golang.org/x/text/transform
 golang.org/x/text/unicode/norm
+# google.golang.org/protobuf v1.36.12
+## explicit; go 1.23
+google.golang.org/protobuf/encoding/protodelim
+google.golang.org/protobuf/encoding/prototext
+google.golang.org/protobuf/encoding/protowire
+google.golang.org/protobuf/internal/descfmt
+google.golang.org/protobuf/internal/descopts
+google.golang.org/protobuf/internal/detrand
+google.golang.org/protobuf/internal/editiondefaults
+google.golang.org/protobuf/internal/encoding/defval
+google.golang.org/protobuf/internal/encoding/messageset
+google.golang.org/protobuf/internal/encoding/tag
+google.golang.org/protobuf/internal/encoding/text
+google.golang.org/protobuf/internal/errors
+google.golang.org/protobuf/internal/filedesc
+google.golang.org/protobuf/internal/filetype
+google.golang.org/protobuf/internal/flags
+google.golang.org/protobuf/internal/genid
+google.golang.org/protobuf/internal/impl
+google.golang.org/protobuf/internal/order
+google.golang.org/protobuf/internal/pragma
+google.golang.org/protobuf/internal/protolazy
+google.golang.org/protobuf/internal/set
+google.golang.org/protobuf/internal/strs
+google.golang.org/protobuf/internal/version
+google.golang.org/protobuf/proto
+google.golang.org/protobuf/reflect/protoreflect
+google.golang.org/protobuf/reflect/protoregistry
+google.golang.org/protobuf/runtime/protoiface
+google.golang.org/protobuf/runtime/protoimpl
+google.golang.org/protobuf/types/known/timestamppb
 # modernc.org/libc v1.75.7
 ## explicit; go 1.25.0
 modernc.org/libc