Revert "SERVER-76427: Rename $telemetry to $queryStats"

This reverts commit d646e44b7801a3e5b3230bbae7dcfe05a5ed8707.

1 files changed, 0 insertions, 215 deletions

diff --git a/src/mongo/db/pipeline/document_source_query_stats.cpp b/src/mongo/db/pipeline/document_source_query_stats.cpp
deleted file mode 100644
index 48f14e0ade6..00000000000
--- a/src/mongo/db/pipeline/document_source_query_stats.cpp
+++ /dev/null
@@ -1,215 +0,0 @@
-/**
- *    Copyright (C) 2022-present MongoDB, Inc.
- *
- *    This program is free software: you can redistribute it and/or modify
- *    it under the terms of the Server Side Public License, version 1,
- *    as published by MongoDB, Inc.
- *
- *    This program is distributed in the hope that it will be useful,
- *    but WITHOUT ANY WARRANTY; without even the implied warranty of
- *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *    Server Side Public License for more details.
- *
- *    You should have received a copy of the Server Side Public License
- *    along with this program. If not, see
- *    <http://www.mongodb.com/licensing/server-side-public-license>.
- *
- *    As a special exception, the copyright holders give permission to link the
- *    code of portions of this program with the OpenSSL library under certain
- *    conditions as described in each individual source file and distribute
- *    linked combinations including the program with the OpenSSL library. You
- *    must comply with the Server Side Public License in all respects for
- *    all of the code used other than as permitted herein. If you modify file(s)
- *    with this exception, you may extend this exception to your version of the
- *    file(s), but you are not obligated to do so. If you do not wish to do so,
- *    delete this exception statement from your version. If you delete this
- *    exception statement from all source files in the program, then also delete
- *    it in the license file.
- */
-
-#include "mongo/db/pipeline/document_source_query_stats.h"
-
-#include "mongo/bson/bsontypes.h"
-#include "mongo/bson/timestamp.h"
-#include "mongo/util/assert_util.h"
-#include "mongo/util/debug_util.h"
-
-#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kQuery
-
-namespace mongo {
-namespace {
-CounterMetric queryStatsHmacApplicationErrors("queryStats.numHmacApplicationErrors");
-}
-
-REGISTER_DOCUMENT_SOURCE_WITH_FEATURE_FLAG(queryStats,
-                                           DocumentSourceQueryStats::LiteParsed::parse,
-                                           DocumentSourceQueryStats::createFromBson,
-                                           AllowedWithApiStrict::kNeverInVersion1,
-                                           feature_flags::gFeatureFlagQueryStats);
-
-namespace {
-/**
- * Try to parse the applyHmacToIdentifiers property from the element.
- */
-boost::optional<bool> parseApplyHmacToIdentifiers(const BSONElement& el) {
-    if (el.fieldNameStringData() == "applyHmacToIdentifiers"_sd) {
-        auto type = el.type();
-        uassert(ErrorCodes::FailedToParse,
-                str::stream() << DocumentSourceQueryStats::kStageName
-                              << " applyHmacToIdentifiers parameter must be boolean. Found type: "
-                              << typeName(type),
-                type == BSONType::Bool);
-        return el.trueValue();
-    }
-    return boost::none;
-}
-
-/**
- * Try to parse the `hmacKey' property from the element.
- */
-boost::optional<std::string> parseHmacKey(const BSONElement& el) {
-    if (el.fieldNameStringData() == "hmacKey"_sd) {
-        auto type = el.type();
-        if (el.isBinData(BinDataType::BinDataGeneral)) {
-            int len;
-            auto data = el.binData(len);
-            uassert(ErrorCodes::FailedToParse,
-                    str::stream() << DocumentSourceQueryStats::kStageName
-                                  << "hmacKey must be greater than or equal to 32 bytes",
-                    len >= 32);
-            return {{data, (size_t)len}};
-        }
-        uasserted(ErrorCodes::FailedToParse,
-                  str::stream()
-                      << DocumentSourceQueryStats::kStageName
-                      << " hmacKey parameter must be bindata of length 32 or greater. Found type: "
-                      << typeName(type));
-    }
-    return boost::none;
-}
-
-/**
- * Parse the spec object calling the `ctor` with the bool applyHmacToIdentifiers and std::string
- * hmacKey arguments.
- */
-template <typename Ctor>
-auto parseSpec(const BSONElement& spec, const Ctor& ctor) {
-    uassert(ErrorCodes::FailedToParse,
-            str::stream() << DocumentSourceQueryStats::kStageName
-                          << " value must be an object. Found: " << typeName(spec.type()),
-            spec.type() == BSONType::Object);
-
-    bool applyHmacToIdentifiers = false;
-    std::string hmacKey;
-    for (auto&& el : spec.embeddedObject()) {
-        if (auto maybeApplyHmacToIdentifiers = parseApplyHmacToIdentifiers(el);
-            maybeApplyHmacToIdentifiers) {
-            applyHmacToIdentifiers = *maybeApplyHmacToIdentifiers;
-        } else if (auto maybeHmacKey = parseHmacKey(el); maybeHmacKey) {
-            hmacKey = *maybeHmacKey;
-        } else {
-            uasserted(ErrorCodes::FailedToParse,
-                      str::stream()
-                          << DocumentSourceQueryStats::kStageName
-                          << " parameters object may only contain 'applyHmacToIdentifiers' or "
-                             "'hmacKey' options. Found: "
-                          << el.fieldName());
-        }
-    }
-
-    return ctor(applyHmacToIdentifiers, hmacKey);
-}
-
-}  // namespace
-
-std::unique_ptr<DocumentSourceQueryStats::LiteParsed> DocumentSourceQueryStats::LiteParsed::parse(
-    const NamespaceString& nss, const BSONElement& spec) {
-    return parseSpec(spec, [&](bool applyHmacToIdentifiers, std::string hmacKey) {
-        return std::make_unique<DocumentSourceQueryStats::LiteParsed>(
-            spec.fieldName(), applyHmacToIdentifiers, hmacKey);
-    });
-}
-
-boost::intrusive_ptr<DocumentSource> DocumentSourceQueryStats::createFromBson(
-    BSONElement spec, const boost::intrusive_ptr<ExpressionContext>& pExpCtx) {
-    const NamespaceString& nss = pExpCtx->ns;
-
-    uassert(ErrorCodes::InvalidNamespace,
-            "$queryStats must be run against the 'admin' database with {aggregate: 1}",
-            nss.db() == DatabaseName::kAdmin.db() && nss.isCollectionlessAggregateNS());
-
-    return parseSpec(spec, [&](bool applyHmacToIdentifiers, std::string hmacKey) {
-        return new DocumentSourceQueryStats(pExpCtx, applyHmacToIdentifiers, hmacKey);
-    });
-}
-
-Value DocumentSourceQueryStats::serialize(SerializationOptions opts) const {
-    // This document source never contains any user information, so no need for any work when
-    // applying hmac.
-    return Value{Document{{kStageName, Document{}}}};
-}
-
-DocumentSource::GetNextResult DocumentSourceQueryStats::doGetNext() {
-    /**
-     * We maintain nested iterators:
-     * - Outer one over the set of partitions.
-     * - Inner one over the set of entries in a "materialized" partition.
-     *
-     * When an inner iterator is present and contains more elements, we can return the next element.
-     * When the inner iterator is exhausted, we move to the next element in the outer iterator and
-     * create a new inner iterator. When the outer iterator is exhausted, we have finished iterating
-     * over the queryStats store entries.
-     *
-     * The inner iterator iterates over a materialized container of all entries in the partition.
-     * This is done to reduce the time under which the partition lock is held.
-     */
-    while (true) {
-        // First, attempt to exhaust all elements in the materialized partition.
-        if (!_materializedPartition.empty()) {
-            // Move out of the container reference.
-            auto doc = std::move(_materializedPartition.front());
-            _materializedPartition.pop_front();
-            return {std::move(doc)};
-        }
-
-        QueryStatsStore& _queryStatsStore = getQueryStatsStore(getContext()->opCtx);
-
-        // Materialized partition is exhausted, move to the next.
-        _currentPartition++;
-        if (_currentPartition >= _queryStatsStore.numPartitions()) {
-            return DocumentSource::GetNextResult::makeEOF();
-        }
-
-        // We only keep the partition (which holds a lock) for the time needed to materialize it to
-        // a set of Document instances.
-        auto&& partition = _queryStatsStore.getPartition(_currentPartition);
-
-        // Capture the time at which reading the partition begins to indicate to the caller
-        // when the snapshot began.
-        const auto partitionReadTime =
-            Timestamp{Timestamp(Date_t::now().toMillisSinceEpoch() / 1000, 0)};
-        for (auto&& [key, metrics] : *partition) {
-            try {
-                auto queryStatsKey = metrics->computeQueryStatsKey(
-                    pExpCtx->opCtx, _applyHmacToIdentifiers, _hmacKey);
-                _materializedPartition.push_back({{"key", std::move(queryStatsKey)},
-                                                  {"metrics", metrics->toBSON()},
-                                                  {"asOf", partitionReadTime}});
-            } catch (const DBException& ex) {
-                queryStatsHmacApplicationErrors.increment();
-                LOGV2_DEBUG(7349403,
-                            3,
-                            "Error encountered when applying hmac to query shape, will not publish "
-                            "queryStats for this entry.",
-                            "status"_attr = ex.toStatus(),
-                            "hash"_attr = key);
-                if (kDebugBuild) {
-                    tasserted(7349401,
-                              "Was not able to re-parse queryStats key when reading queryStats.");
-                }
-            }
-        }
-    }
-}
-
-}  // namespace mongo