Replace bindata packages with stdlib go:embed.
Modernize some uiserver code with newer interfaces introduced in go 1.16 (mainly working with fs.File instead of http.File.
Remove steps that are no longer used from our build files.
Add Github Action to detect differences in agent/uiserver/dist and verify that the files are correct (by compiling UI assets and comparing contents).
Adds a new query param merge-central-config for use with the below endpoints:
/catalog/service/:service
/catalog/connect/:service
/health/service/:service
/health/connect/:service
If set on the request, the response will include a fully resolved service definition which is merged with the proxy-defaults/global and service-defaults/:service config entries (on-demand style). This is useful to view the full service definition for a mesh service (connect-proxy kind or gateway kind) which might not be merged before being written into the catalog (example: in case of services in the agentless model).
* ui: Use new icon-size and icon-color for popover-menus
* Remove the default currentColor plus add some more defaults
* Undo transparency overwrites now we don't need them
* Fixup discochain icons
* Undo a default icon rule for vert align
* Fixup expanded icon for meatball popovers
* Fixup intention permission labels/badges/icons
* Remove different res icon
* Remove icon resolutions
- Introduce a new telemetry configurable parameter retry_failed_connection. User can set the value to true to let consul agent continue its start process on failed connection to datadog server. When set to false, agent will stop on failed start. The default behavior is true.
Co-authored-by: Dan Upton <daniel@floppy.co>
Co-authored-by: Evan Culver <eculver@users.noreply.github.com>
Add validation to ensure connect native services have a port or socketpath specified on catalog registration.
This was the only missing piece to ensure all mesh services are validated for a port (or socketpath) specification on catalog registration.
* Support vault namespaces in connect CA
Follow on to some missed items from #12655
From an internal ticket "Support standard "Vault namespace in the
path" semantics for Connect Vault CA Provider"
Vault allows the namespace to be specified as a prefix in the path of
a PKI definition, but our usage of the Vault API includes calls that
don't support a namespaced key. In particular the sys.* family of
calls simply appends the key, instead of prefixing the namespace in
front of the path.
Unfortunately it is difficult to reliably parse a path with a
namespace; only vault knows what namespaces are present, and the '/'
separator can be inside a key name, as well as separating path
elements. This is in use in the wild; for example
'dc1/intermediate-key' is a relatively common naming schema.
Instead we add two new fields: RootPKINamespace and
IntermediatePKINamespace, which are the absolute namespace paths
'prefixed' in front of the respective PKI Paths.
Signed-off-by: Mark Anderson <manderson@hashicorp.com>
Introduces two new public gRPC endpoints (`Login` and `Logout`) and
includes refactoring of the equivalent net/rpc endpoints to enable the
majority of logic to be reused (i.e. by extracting the `Binder` and
`TokenWriter` types).
This contains the OSS portions of the following enterprise commits:
- 75fcdbfcfa6af21d7128cb2544829ead0b1df603
- bce14b714151af74a7f0110843d640204082630a
- cc508b70fbf58eda144d9af3d71bd0f483985893
Description
Add x-fowarded-client-cert information on trusted incoming connections.
Envoy provides support forwarding and annotating the
x-forwarded-client-cert header via the forward_client_cert_details
set_current_client_cert_details filter fields. It would be helpful for
consul to support this directly in its config. The escape hatches are
a bit cumbersome for this purpose.
This has been implemented on incoming connections to envoy. Outgoing
(from the local service through the sidecar) will not have a
certificate, and so are left alone.
A service on an incoming connection will now get headers something like this:
```
X-Forwarded-Client-Cert:[By=spiffe://efad7282-d9b2-3298-f6d8-38b37fb58df3.consul/ns/default/dc/dc1/svc/counting;Hash=61ad5cbdfcb50f5a3ec0ca60923d61613c149a9d4495010a64175c05a0268ab2;Cert="-----BEGIN%20CERTIFICATE-----%0AMIICHDCCAcOgAwIBAgIBCDAKBggqhkjOPQQDAjAxMS8wLQYDVQQDEyZwcmktMTli%0AYXdyb2YuY29uc3VsLmNhLmVmYWQ3MjgyLmNvbnN1bDAeFw0yMjA0MjkwMzE0NTBa%0AFw0yMjA1MDIwMzE0NTBaMAAwWTATBgcqhkjOPQIBBggqhkjOPQMBBwNCAARVIZ7Y%0AZEXfbOGBfxGa7Vuok1MIng%2FuzLQK2xLVlSTIPDbO5hstTGP%2B%2FGx182PYFP3jYqk5%0Aq6rYWe1wiPNMA30Io4H8MIH5MA4GA1UdDwEB%2FwQEAwIDuDAdBgNVHSUEFjAUBggr%0ABgEFBQcDAgYIKwYBBQUHAwEwDAYDVR0TAQH%2FBAIwADApBgNVHQ4EIgQgrp4q50oX%0AHHghMbxz5Bk8OJFWMdfgH0Upr350WlhyxvkwKwYDVR0jBCQwIoAgUe6uERAIj%2FLM%0AyuFzDc3Wbp9TGAKBJYAwyhF14ToOQCMwYgYDVR0RAQH%2FBFgwVoZUc3BpZmZlOi8v%0AZWZhZDcyODItZDliMi0zMjk4LWY2ZDgtMzhiMzdmYjU4ZGYzLmNvbnN1bC9ucy9k%0AZWZhdWx0L2RjL2RjMS9zdmMvZGFzaGJvYXJkMAoGCCqGSM49BAMCA0cAMEQCIDwb%0AFlchufggNTijnQ5SUcvTZrWlZyq%2FrdVC20nbbmWLAiAVshNNv1xBqJI1NmY2HI9n%0AgRMfb8aEPVSuxEHhqy57eQ%3D%3D%0A-----END%20CERTIFICATE-----%0A";Chain="-----BEGIN%20CERTIFICATE-----%0AMIICHDCCAcOgAwIBAgIBCDAKBggqhkjOPQQDAjAxMS8wLQYDVQQDEyZwcmktMTli%0AYXdyb2YuY29uc3VsLmNhLmVmYWQ3MjgyLmNvbnN1bDAeFw0yMjA0MjkwMzE0NTBa%0AFw0yMjA1MDIwMzE0NTBaMAAwWTATBgcqhkjOPQIBBggqhkjOPQMBBwNCAARVIZ7Y%0AZEXfbOGBfxGa7Vuok1MIng%2FuzLQK2xLVlSTIPDbO5hstTGP%2B%2FGx182PYFP3jYqk5%0Aq6rYWe1wiPNMA30Io4H8MIH5MA4GA1UdDwEB%2FwQEAwIDuDAdBgNVHSUEFjAUBggr%0ABgEFBQcDAgYIKwYBBQUHAwEwDAYDVR0TAQH%2FBAIwADApBgNVHQ4EIgQgrp4q50oX%0AHHghMbxz5Bk8OJFWMdfgH0Upr350WlhyxvkwKwYDVR0jBCQwIoAgUe6uERAIj%2FLM%0AyuFzDc3Wbp9TGAKBJYAwyhF14ToOQCMwYgYDVR0RAQH%2FBFgwVoZUc3BpZmZlOi8v%0AZWZhZDcyODItZDliMi0zMjk4LWY2ZDgtMzhiMzdmYjU4ZGYzLmNvbnN1bC9ucy9k%0AZWZhdWx0L2RjL2RjMS9zdmMvZGFzaGJvYXJkMAoGCCqGSM49BAMCA0cAMEQCIDwb%0AFlchufggNTijnQ5SUcvTZrWlZyq%2FrdVC20nbbmWLAiAVshNNv1xBqJI1NmY2HI9n%0AgRMfb8aEPVSuxEHhqy57eQ%3D%3D%0A-----END%20CERTIFICATE-----%0A";Subject="";URI=spiffe://efad7282-d9b2-3298-f6d8-38b37fb58df3.consul/ns/default/dc/dc1/svc/dashboard]
```
Closes#12852
The primary bug here is in the streaming subsystem that makes the overall v1/health/service/:service request behave incorrectly when servicing a blocking request with a filter provided.
There is a secondary non-streaming bug being fixed here that is much less obvious related to when to update the `reply` variable in a `blockingQuery` evaluation. It is unlikely that it is triggerable in practical environments and I could not actually get the bug to manifest, but I fixed it anyway while investigating the original issue.
Simple reproduction (streaming):
1. Register a service with a tag.
curl -sL --request PUT 'http://localhost:8500/v1/agent/service/register' \
--header 'Content-Type: application/json' \
--data-raw '{ "ID": "ID1", "Name": "test", "Tags":[ "a" ], "EnableTagOverride": true }'
2. Do an initial filter query that matches on the tag.
curl -sLi --get 'http://localhost:8500/v1/health/service/test' --data-urlencode 'filter=a in Service.Tags'
3. Note you get one result. Use the `X-Consul-Index` header to establish
a blocking query in another terminal, this should not return yet.
curl -sLi --get 'http://localhost:8500/v1/health/service/test?index=$INDEX' --data-urlencode 'filter=a in Service.Tags'
4. Re-register that service with a different tag.
curl -sL --request PUT 'http://localhost:8500/v1/agent/service/register' \
--header 'Content-Type: application/json' \
--data-raw '{ "ID": "ID1", "Name": "test", "Tags":[ "b" ], "EnableTagOverride": true }'
5. Your blocking query from (3) should return with a header
`X-Consul-Query-Backend: streaming` and empty results if it works
correctly `[]`.
Attempts to reproduce with non-streaming failed (where you add `&near=_agent` to the read queries and ensure `X-Consul-Query-Backend: blocking-query` shows up in the results).
* update raft to v1.3.7
* add changelog
* fix compilation error
* fix HeartbeatTimeout
* fix ElectionTimeout to reload only if value is valid
* fix default values for `ElectionTimeout` and `HeartbeatTimeout`
* fix test defaults
* bump raft to v1.3.8
Adds a timeout (deadline) to client RPC calls, so that streams will no longer hang indefinitely in unstable network conditions.
Co-authored-by: kisunji <ckim@hashicorp.com>
* Implement the ServerDiscovery.WatchServers gRPC endpoint
* Fix the ConnectCA.Sign gRPC endpoints metadata forwarding.
* Unify public gRPC endpoints around the public.TraceID function for request_id logging
Fixes#12048Fixes#12319
Regression introduced in #11693
Local reproduction steps:
1. `consul agent -dev`
2. `curl -sLiv 'localhost:8500/v1/agent/connect/ca/leaf/web'`
3. make note of the `X-Consul-Index` header returned
4. `curl -sLi 'localhost:8500/v1/agent/connect/ca/leaf/web?index=<VALUE_FROM_STEP_3>'`
5. Kill the above curl when it hangs with Ctrl-C
6. Repeat (2) and it should not hang.
Adds a new gRPC endpoint to get envoy bootstrap params. The new consul-dataplane service will use this
endpoint to generate an envoy bootstrap configuration.
* add queryBackend to the api query meta.
* add a changelog
* use string type instead of int
* Apply suggestions from code review
Co-authored-by: R.B. Boyer <4903+rboyer@users.noreply.github.com>
Co-authored-by: R.B. Boyer <4903+rboyer@users.noreply.github.com>
Introduces a gRPC endpoint for signing Connect leaf certificates. It's also
the first of the public gRPC endpoints to perform leader-forwarding, so
establishes the pattern of forwarding over the multiplexed internal RPC port.
Fixes#11253
$ go mod why -m github.com/dgrijalva/jwt-go
# github.com/dgrijalva/jwt-go
(main module does not need module github.com/dgrijalva/jwt-go)
$ go mod why -m github.com/form3tech-oss/jwt-go
# github.com/form3tech-oss/jwt-go
github.com/hashicorp/consul/agent
github.com/hashicorp/go-discover
github.com/hashicorp/go-discover/provider/azure
github.com/Azure/go-autorest/autorest
github.com/Azure/go-autorest/autorest/adal
github.com/form3tech-oss/jwt-go
* ui: Add more explanatory texts for empty states
* Change all template "Read the guide"s
* Add missing htmlSafe
* Remove the stuff I commented out to try and grok the hairy rebase
* Changelog
* More rebased yaml weirdness plus added node:read
Just like standard upstreams the order of applicability in descending precedence:
1. caller's `service-defaults` upstream override for destination
2. caller's `service-defaults` upstream defaults
3. destination's `service-resolver` ConnectTimeout
4. system default of 5s
Co-authored-by: mrspanishviking <kcardenas@hashicorp.com>
If a service is automatically registered because it has a critical health check
for longer than deregister_critical_service_after, the error message will now
include:
- mention of the deregister_critical_service_after option
- the value of deregister_critical_service_after for that check
* Fixes a lint warning about t.Errorf not supporting %w
* Enable running autopilot on all servers
On the non-leader servers all they do is update the state and do not attempt any modifications.
* Fix the RPC conn limiting tests
Technically they were relying on racey behavior before. Now they should be reliable.
Adds a new gRPC streaming endpoint (WatchRoots) that dataplane clients will
use to fetch the current list of active Connect CA roots and receive new
lists whenever the roots are rotated.
* Avoid doing list of /sys/mounts
From an internal ticket "Support standard "Vault namespace in the path" semantics for Connect Vault CA Provider"
Vault allows the namespace to be specified as a prefix in the path of
a PKI definition, but this doesn't currently work for
```IntermediatePKIPath``` specifications, because we attempt to list
all of the paths to check if ours is already defined. This doesn't
really work in a namespaced world.
This changes the IntermediatePKIPath code to follow the same pattern
as the root key, where we directly get the key rather than listing.
This code is difficult to write automated tests for because it relies
on features of Vault Enterprise, which isn't currently part of our
test framework, so it was tested manually.
Signed-off-by: Mark Anderson <manderson@hashicorp.com>
* add changelog
Signed-off-by: Mark Anderson <manderson@hashicorp.com>
* add config watcher to the config package
* add logging to watcher
* add test and refactor to add WatcherEvent.
* add all API calls and fix a bug with recreated files
* add tests for watcher
* remove the unnecessary use of context
* Add debug log and a test for file rename
* use inode to detect if the file is recreated/replaced and only listen to create events.
* tidy ups (#1535)
* tidy ups
* Add tests for inode reconcile
* fix linux vs windows syscall
* fix linux vs windows syscall
* fix windows compile error
* increase timeout
* use ctime ID
* remove remove/creation test as it's a use case that fail in linux
* fix linux/windows to use Ino/CreationTime
* fix the watcher to only overwrite current file id
* fix linter error
* fix remove/create test
* set reconcile loop to 200 Milliseconds
* fix watcher to not trigger event on remove, add more tests
* on a remove event try to add the file back to the watcher and trigger the handler if success
* fix race condition
* fix flaky test
* fix race conditions
* set level to info
* fix when file is removed and get an event for it after
* fix to trigger handler when we get a remove but re-add fail
* fix error message
* add tests for directory watch and fixes
* detect if a file is a symlink and return an error on Add
* rename Watcher to FileWatcher and remove symlink deref
* add fsnotify@v1.5.1
* fix go mod
* do not reset timer on errors, rename OS specific files
* rename New func
* events trigger on write and rename
* add missing test
* fix flaking tests
* fix flaky test
* check reconcile when removed
* delete invalid file
* fix test to create files with different mod time.
* back date file instead of sleeping
* add watching file in agent command.
* fix watcher call to use new API
* add configuration and stop watcher when server stop
* add certs as watched files
* move FileWatcher to the agent start instead of the command code
* stop watcher before replacing it
* save watched files in agent
* add add and remove interfaces to the file watcher
* fix remove to not return an error
* use `Add` and `Remove` to update certs files
* fix tests
* close events channel on the file watcher even when the context is done
* extract `NotAutoReloadableRuntimeConfig` is a separate struct
* fix linter errors
* add Ca configs and outgoing verify to the not auto reloadable config
* add some logs and fix to use background context
* add tests to auto-config reload
* remove stale test
* add tests to changes to config files
* add check to see if old cert files still trigger updates
* rename `NotAutoReloadableRuntimeConfig` to `StaticRuntimeConfig`
* fix to re add both key and cert file. Add test to cover this case.
* review suggestion
Co-authored-by: R.B. Boyer <4903+rboyer@users.noreply.github.com>
* add check to static runtime config changes
* fix test
* add changelog file
* fix review comments
* Apply suggestions from code review
Co-authored-by: R.B. Boyer <4903+rboyer@users.noreply.github.com>
* update flag description
Co-authored-by: FFMMM <FFMMM@users.noreply.github.com>
* fix compilation error
* add static runtime config support
* fix test
* fix review comments
* fix log test
* Update .changelog/12329.txt
Co-authored-by: Dan Upton <daniel@floppy.co>
* transfer tests to runtime_test.go
* fix filewatcher Replace to not deadlock.
* avoid having lingering locks
Co-authored-by: R.B. Boyer <4903+rboyer@users.noreply.github.com>
* split ReloadConfig func
* fix warning message
Co-authored-by: R.B. Boyer <4903+rboyer@users.noreply.github.com>
* convert `FileWatcher` into an interface
* fix compilation errors
* fix tests
* extract func for adding and removing files
Co-authored-by: Ashwin Venkatesh <ashwin@hashicorp.com>
Co-authored-by: R.B. Boyer <4903+rboyer@users.noreply.github.com>
Co-authored-by: FFMMM <FFMMM@users.noreply.github.com>
Co-authored-by: Daniel Upton <daniel@floppy.co>
This adds an aws-iam auth method type which supports authenticating to Consul using AWS IAM identities.
Co-authored-by: R.B. Boyer <4903+rboyer@users.noreply.github.com>
- `tls.incoming`: applies to the inbound mTLS targeting the public
listener on `connect-proxy` and `terminating-gateway` envoy instances
- `tls.outgoing`: applies to the outbound mTLS dialing upstreams from
`connect-proxy` and `ingress-gateway` envoy instances
Fixes#11966
* Fix leaked Vault LifetimeRenewers
When the Vault CA Provider is reconfigured we do not stop the
LifetimeRenewers which can cause them to leak until the Consul processes
recycles. On Configure execute stopWatcher if it exists and is not nil
before starting a new renewal
* Add jitter before restarting the LifetimeWatcher
If we fail to login to Vault or our token is no longer valid we can
overwhelm a Vault instance with many requests very quickly by restarting
the LifetimeWatcher. Before restarting the LifetimeWatcher provide a
backoff time of 1 second or less.
* Use a retry.Waiter instead of RandomStagger
* changelog
* gofmt'd
* Swap out bool for atomic.Unit32 in test
* Provide some extra clarification in comment and changelog
* tlsutil: initial implementation of types/TLSVersion
tlsutil: add test for parsing deprecated agent TLS version strings
tlsutil: return TLSVersionInvalid with error
tlsutil: start moving tlsutil cipher suite lookups over to types/tls
tlsutil: rename tlsLookup to ParseTLSVersion, add cipherSuiteLookup
agent: attempt to use types in runtime config
agent: implement b.tlsVersion validation in config builder
agent: fix tlsVersion nil check in builder
tlsutil: update to renamed ParseTLSVersion and goTLSVersions
tlsutil: fixup TestConfigurator_CommonTLSConfigTLSMinVersion
tlsutil: disable invalid config parsing tests
tlsutil: update tests
auto_config: lookup old config strings from base.TLSMinVersion
auto_config: update endpoint tests to use TLS types
agent: update runtime_test to use TLS types
agent: update TestRuntimeCinfig_Sanitize.golden
agent: update config runtime tests to expect TLS types
* website: update Consul agent tls_min_version values
* agent: fixup TLS parsing and compilation errors
* test: fixup lint issues in agent/config_runtime_test and tlsutil/config_test
* tlsutil: add CHACHA20_POLY1305 cipher suites to goTLSCipherSuites
* test: revert autoconfig tls min version fixtures to old format
* types: add TLSVersions public function
* agent: add warning for deprecated TLS version strings
* agent: move agent config specific logic from tlsutil.ParseTLSVersion into agent config builder
* tlsutil(BREAKING): change default TLS min version to TLS 1.2
* agent: move ParseCiphers logic from tlsutil into agent config builder
* tlsutil: remove unused CipherString function
* agent: fixup import for types package
* Revert "tlsutil: remove unused CipherString function"
This reverts commit 6ca7f6f58d268e617501b7db9500113c13bae70c.
* agent: fixup config builder and runtime tests
* tlsutil: fixup one remaining ListenerConfig -> ProtocolConfig
* test: move TLS cipher suites parsing test from tlsutil into agent config builder tests
* agent: remove parseCiphers helper from auto_config_endpoint_test
* test: remove unused imports from tlsutil
* agent: remove resolved FIXME comment
* tlsutil: remove TODO and FIXME in cipher suite validation
* agent: prevent setting inherited cipher suite config when TLS 1.3 is specified
* changelog: add entry for converting agent config to TLS types
* agent: remove FIXME in runtime test, this is covered in builder tests with invalid tls9 value now
* tlsutil: remove config tests for values checked at agent config builder boundary
* tlsutil: remove tls version check from loadProtocolConfig
* tlsutil: remove tests and TODOs for logic checked in TestBuilder_tlsVersion and TestBuilder_tlsCipherSuites
* website: update search link for supported Consul agent cipher suites
* website: apply review suggestions for tls_min_version description
* website: attempt to clean up markdown list formatting for tls_min_version
* website: moar linebreaks to fix tls_min_version formatting
* Revert "website: moar linebreaks to fix tls_min_version formatting"
This reverts commit 38585927422f73ebf838a7663e566ac245f2a75c.
* autoconfig: translate old values for TLSMinVersion
* agent: rename var for translated value of deprecated TLS version value
* Update agent/config/deprecated.go
Co-authored-by: Dan Upton <daniel@floppy.co>
* agent: fix lint issue
* agent: fixup deprecated config test assertions for updated warning
Co-authored-by: Dan Upton <daniel@floppy.co>
This extends the acl.AllowAuthorizer with source of authority information.
The next step is to unify the AllowAuthorizer and ACLResolveResult structures; that will be done in a separate PR.
Part of #12481
Signed-off-by: Mark Anderson <manderson@hashicorp.com>
Introduces the capability to configure TLS differently for Consul's
listeners/ports (i.e. HTTPS, gRPC, and the internal multiplexed RPC
port) which is useful in scenarios where you may want the HTTPS or
gRPC interfaces to present a certificate signed by a well-known/public
CA, rather than the certificate used for internal communication which
must have a SAN in the form `server.<dc>.consul`.
Give the user a hint that they might be doing something wrong if their GET
request has a non-empty body, which can easily happen using curl's
--data-urlencode if specifying request type via "--request GET" rather than
"--get". See https://github.com/hashicorp/consul/issues/11471.
* First pass for helper for bulk changes
Signed-off-by: Mark Anderson <manderson@hashicorp.com>
* Convert ACLRead and ACLWrite to new form
Signed-off-by: Mark Anderson <manderson@hashicorp.com>
* AgentRead and AgentWRite
Signed-off-by: Mark Anderson <manderson@hashicorp.com>
* Fix EventWrite
Signed-off-by: Mark Anderson <manderson@hashicorp.com>
* KeyRead, KeyWrite, KeyList
Signed-off-by: Mark Anderson <manderson@hashicorp.com>
* KeyRing
Signed-off-by: Mark Anderson <manderson@hashicorp.com>
* NodeRead NodeWrite
Signed-off-by: Mark Anderson <manderson@hashicorp.com>
* OperatorRead and OperatorWrite
Signed-off-by: Mark Anderson <manderson@hashicorp.com>
* PreparedQuery
Signed-off-by: Mark Anderson <manderson@hashicorp.com>
* Intention partial
Signed-off-by: Mark Anderson <manderson@hashicorp.com>
* Fix ServiceRead, Write ,etc
Signed-off-by: Mark Anderson <manderson@hashicorp.com>
* Error check ServiceRead?
Signed-off-by: Mark Anderson <manderson@hashicorp.com>
* Fix Sessionread/Write
Signed-off-by: Mark Anderson <manderson@hashicorp.com>
* Fixup snapshot ACL
Signed-off-by: Mark Anderson <manderson@hashicorp.com>
* Error fixups for txn
Signed-off-by: Mark Anderson <manderson@hashicorp.com>
* Add changelog
Signed-off-by: Mark Anderson <manderson@hashicorp.com>
* Fixup review comments
Signed-off-by: Mark Anderson <manderson@hashicorp.com>
Minor fix for behavior in #12362
IsDefault sometimes returns true even if there was a proxy-defaults or service-defaults config entry that was consulted. This PR fixes that.
Starting from and extending the mechanism introduced in #12110 we can specially handle the 3 main special Consul RPC endpoints that react to many config entries in a single blocking query in Connect:
- `DiscoveryChain.Get`
- `ConfigEntry.ResolveServiceConfig`
- `Intentions.Match`
All of these will internally watch for many config entries, and at least one of those will likely be not found in any given query. Because these are blends of multiple reads the exact solution from #12110 isn't perfectly aligned, but we can tweak the approach slightly and regain the utility of that mechanism.
### No Config Entries Found
In this case, despite looking for many config entries none may be found at all. Unlike #12110 in this scenario we do not return an empty reply to the caller, but instead synthesize a struct from default values to return. This can be handled nearly identically to #12110 with the first 1-2 replies being non-empty payloads followed by the standard spurious wakeup suppression mechanism from #12110.
### No Change Since Last Wakeup
Once a blocking query loop on the server has completed and slept at least once, there is a further optimization we can make here to detect if any of the config entries that were present at specific versions for the prior execution of the loop are identical for the loop we just woke up for. In that scenario we can return a slightly different internal sentinel error and basically externally handle it similar to #12110.
This would mean that even if 20 discovery chain read RPC handling goroutines wakeup due to the creation of an unrelated config entry, the only ones that will terminate and reply with a blob of data are those that genuinely have new data to report.
### Extra Endpoints
Since this pattern is pretty reusable, other key config-entry-adjacent endpoints used by `agent/proxycfg` also were updated:
- `ConfigEntry.List`
- `Internal.IntentionUpstreams` (tproxy)
